---
title: Batteries, circuits and how electricity flows — how Mova does on the tests · Physics
description: Lesson 27 of the physics course of Mova's primary school: 5 of 11 tests right, exam 2 of 4, every question with the options, the student's choice, the right answer and why it chose.
---

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# Batteries, circuits and how electricity flows

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**Tests:** 5 of 11 right · **Exam:** 2 of 4 right · **Kind:** plain · **Understood:** 4 of 15 · **Run:** 2026-10-18, commit `f3c23ea72`

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Lesson 27 of the physics course of Mova's primary school, as Mova's small model took its tests: it had read this lesson and the ones before it and learned from their exercises. Each test shows the options in the order the student saw them, its choice, the right answer, the score of every option and why it chose. The lesson itself, sentence by sentence with trees and pragmatics: [the lesson in the corpora](https://md.mova.elamur.ai/free/en/corpora/school/physics/27-batteries-circuits-and-how-electricity-flows/).

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Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: [the lesson's questions in the corpora](https://md.mova.elamur.ai/free/en/corpora/questions/physics/27-batteries-circuits-and-how-electricity-flows/).

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### Test 1 · right ✓ {#t1}

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my little bro says the battery's full of electricity like juice in a carton. right?

- **1.** No, it holds chemicals that push electricity round the circuit — **← Mova's choice** · **✓ the right answer** · score 8
- **2.** No, batteries are full of tiny lightning bolts — no support
- **3.** Yes, that's why batteries are heavy — no support
- **4.** Yes, and it pours out when you open the switch — no support

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**Why:** It took the question to ask which statement is true. It chose option 1 with score 8, the only option with support. Its support: lesson 27, line 3: «A battery does not hold a tankful of electricity: it holds chemicals that push electricity round the loop, and when those chemicals are used up the battery is…», reached through the option's own match among the sentences about the question's things. What matched: the same action «hold» (+3); the same thing acted on «chemicals» (+3); the same doer «battery» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/27-batteries-circuits-and-how-electricity-flows/t1/)

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### Test 2 · right ✓ {#t2}

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Sam joins a bulb to a battery with only one wire. Why doesn't it light?

- **1.** There is no complete loop for the electricity to flow round — **← Mova's choice** · **✓ the right answer** · no support
- **2.** One wire is too short to carry electricity — no support
- **3.** The bulb needs to warm up first — no support
- **4.** The battery only works with a switch — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/27-batteries-circuits-and-how-electricity-flows/t2/)

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### Test 3 · right ✓ {#t3}

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In a cartoon, a robot fixes a frayed cable by wrapping it in tin foil. What's wrong with that?

- **1.** Foil is metal and carries electricity, so it does not insulate — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Foil is too shiny to touch electricity — no support
- **3.** Foil makes the electricity colder and slower — no support
- **4.** Nothing, tin foil is the very best way to cover up a broken wire — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/27-batteries-circuits-and-how-electricity-flows/t3/)

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### Test 4 · right ✓ {#t4}

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What would happen if a house had no fuses or trip switches at all?

- **1.** Overloaded wires could overheat and start a fire — **← Mova's choice** · **✓ the right answer** · no support
- **2.** The house would not be able to get any electricity at all — no support
- **3.** Nothing, fuses are only there as decoration anyway — no support
- **4.** The lights would get brighter and brighter every day — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/27-batteries-circuits-and-how-electricity-flows/t4/)

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### Test 5 · wrong ✗ {#t5}

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ugh mum's got like 6 things plugged into one adaptor, chill or nah?

- **1.** Fine, the adaptor makes extra electricity — **← Mova's choice** · no support
- **2.** Fine, as long as the lights are off — no support
- **3.** Not chill, too many things on one socket can overheat and start a fire — **✓ the right answer** · no support
- **4.** Totally chill, sockets can take anything — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/27-batteries-circuits-and-how-electricity-flows/t5/)

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### Test 6 · wrong ✗ {#t6}

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Why must nobody ever poke a knife into a toaster, even to get stuck toast out?

- **1.** The knife will make the toast taste of metal — **← Mova's choice** · no support
- **2.** The bread will catch fire from the knife — no support
- **3.** The knife will cool the hot wires down and make them break — no support
- **4.** The wires inside are live and can give a deadly shock — **✓ the right answer** · no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/27-batteries-circuits-and-how-electricity-flows/t6/)

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### Test 7 · wrong ✗ {#t7}

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Lily wants to charge her phone under her pillow overnight. Good idea?

- **1.** Yes, phones charge faster in the dark — **← Mova's choice** · no support
- **2.** No, the heat cannot escape and it could overheat — **✓ the right answer** · no support
- **3.** Yes, the pillow keeps the battery warm and happy — no support
- **4.** No, the pillow will drain the battery — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/27-batteries-circuits-and-how-electricity-flows/t7/)

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### Test 8 · wrong ✗ {#t8}

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Jake sees wires on pylons high above the field. Why are they so high up?

- **1.** Birds would eat the wires if they were lower — no support
- **2.** Electricity flows better near the clouds — **← Mova's choice** · score 1
- **3.** They carry very high voltage, so they are kept far from people — **✓ the right answer** · no support
- **4.** It makes the electricity arrive faster — no support

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**Why:** It took the question to ask why something happens (its cause). It chose option 2 with score 1, the only option with support. Its support: lesson 27, line 13: «A fuse has a thin wire that melts if too much electricity flows, breaking the circuit before the wires in the walls overheat; plugging too many things into one…», reached through the same lesson line as the sentence the question matched. What matched: the same action «flow» (+3); the same doer «much electricity» (+1). Against it: one says «not», the other does not (counts against) (-3). The right option, 3, found no support in what it remembers. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/27-batteries-circuits-and-how-electricity-flows/t8/)

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### Test 9 · wrong ✗ {#t9}

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Which of these would complete a circuit if used to bridge a gap?

- **1.** A rubber eraser — **← Mova's choice** · no support
- **2.** A steel paper clip — **✓ the right answer** · no support
- **3.** A plastic straw — no support
- **4.** A wooden lolly stick — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/27-batteries-circuits-and-how-electricity-flows/t9/)

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### Test 10 · right ✓ {#t10}

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one bulb on the tree went pop and the whole bloody string's dead. why??

- **1.** The plug is angry and switched itself off — no support
- **2.** The broken bulb drank the rest of the electricity — score 2
- **3.** The bang scared the other bulbs off — no support
- **4.** In that string the bulbs share one loop, and the break stops the flow — **← Mova's choice** · **✓ the right answer** · score 3

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**Why:** It took the question to ask why something happens (its cause). It chose option 4 with score 3, against 2 for the next best. Its support: lesson 27, line 14: «In some strings of Christmas lights all the bulbs are in one loop, so one broken bulb stops the flow to all of them; newer strings give each bulb its own path.», reached through a sentence linked to the one the question matched. What matched: the same action «stop» (+2); the same thing acted on «flow» (+2). Against it: a different doer (counts against) (-1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/27-batteries-circuits-and-how-electricity-flows/t10/)

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### Test 11 · wrong ✗ {#t11}

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Why can a rechargeable battery be used again but an ordinary one cannot?

- **1.** Rechargeable batteries are filled up with fresh electricity — no support
- **2.** Rechargeable batteries never use their chemicals at all — **← Mova's choice** · score 6
- **3.** Ordinary batteries are just made of cheaper plastic — no support
- **4.** A charger can push its chemicals back to how they were — **✓ the right answer** · no support

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**Why:** It took the question to ask why something happens (its cause). It chose option 2 with score 6, the only option with support. Its support: lesson 27, line 3: «A battery does not hold a tankful of electricity: it holds chemicals that push electricity round the loop, and when those chemicals are used up the battery is…», reached through the option's own match among the sentences about the question's things. What matched: the same doer «battery» (+3); the same thing acted on «chemicals» (+2); a different action (counts against) (+1). The right option, 4, found no support in what it remembers. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/27-batteries-circuits-and-how-electricity-flows/t11/)

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### Exam question 1 · formal language · wrong ✗ {#e1}

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Identify the condition necessary for an electric current to flow through a lamp connected to a battery.

- **1.** The placement of the lamp nearer to the battery — **← Mova's choice** · no support
- **2.** The provision of a complete and unbroken circuit — **✓ the right answer** · no support
- **3.** The presence of a plastic covering upon every conductor — no support
- **4.** The connection of the lamp by a single wire alone — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/27-batteries-circuits-and-how-electricity-flows/e1/)

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### Exam question 2 · formal language · wrong ✗ {#e2}

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Which of the following statements most accurately characterises the function of a fuse?

- **1.** It increases the voltage delivered to household appliances — **← Mova's choice** · no support
- **2.** It stores electrical energy against a failure of supply — no support
- **3.** It melts and interrupts the circuit when an excessive current flows — **✓ the right answer** · no support
- **4.** It converts alternating current into stored chemical energy — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/27-batteries-circuits-and-how-electricity-flows/e2/)

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### Exam question 3 · formal language · right ✓ {#e3}

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Select the response consistent with the established facts concerning the contents of a battery.

- **1.** Energy is stored in chemical form and released as a current — **← Mova's choice** · **✓ the right answer** · no support
- **2.** It contains no energy at all until it is connected to a switch — no support
- **3.** Electricity is retained within it in liquid form — no support
- **4.** It contains a small quantity of compressed lightning — no support

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**Why:** Nothing it remembers matched the question, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/27-batteries-circuits-and-how-electricity-flows/e3/)

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### Exam question 4 · formal language · right ✓ {#e4}

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Ascertain the principal reason for which copper conductors are enclosed in a plastic sheath.

- **1.** Plastic does not conduct, thereby preventing the escape of current — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Plastic accelerates the passage of the current — no support
- **3.** Plastic renders the copper magnetic — no support
- **4.** Plastic stores surplus charge for subsequent use — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/27-batteries-circuits-and-how-electricity-flows/e4/)

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- ← previous: [26. Static electricity: balloons, hair and sparks](https://md.mova.elamur.ai/free/en/school-run/physics/26-static-electricity-balloons-hair-and-sparks/)
- next →: [28. Electricity and safety](https://md.mova.elamur.ai/free/en/school-run/physics/28-electricity-and-safety/)
- ↑ back to [Physics](https://md.mova.elamur.ai/free/en/school-run/physics/)