M4 - WHAT I KNOW - ELECTRIC CIRCUIT

1. In a simple circuit with long coiled wire, 1.5 volts and a bulb. Why does the bulb get

dimmer?

• A. because the load is too many

• B. because the wire is too long

• C. because the wire is too short

• D. because the power supply is not enough to light the bulb brighter

2. Imagine a simple circuit with one 1.5 volts battery and a bulb. When the 1.5 volts battery is replaced with a 3 volts battery. What will happen?

• A. The bulb gets brighter.

• B. The bulb gets dimmer.

• C. Nothing has changed.

• D. The bulb stays at the same level of brightness.

3. Imagine a circuit with a 1.5 volts battery and a bulb and a similar circuit with a 3 volts battery and two bulbs. Which has the brighter glow?

• A. The bulbs in both circuits will not lit.

• B. The circuit with 1.5 volts battery and one bulb.

• C. The circuit with 3 volts battery and two bulbs.

• D. The bulbs in both circuits are of similar brightness levels.

Why might a bulb have busted when a 3 pieces 3 volts battery are both connected across in a simple series circuit?

• A. The batteries are not connected properly.

• B. The batteries are used up or uncharged

• C. There is insufficient electricity flowing in the circuit.

• D. Too much electricity flows through the bulb’s filament and the bulb blows.

5. What is the effect of changing the wire in a circuit from a straight short wire to a longer coiled thick wire?

• A. Nothing has changed.

• B. The bulbs become dimmer.

• C. The bulbs become brighter.

• D. The bulbs stay at the same level of brightness.

Which statement is correct about electric current powered by a battery?

I. It always flows clockwise.

II. It gets used up as it goes around the circuit.

III. It does not get used up as it goes around the circuit.

• A. I

• B. III

• C. I and II

• D. I, II and III

What needs to be done to this circuit so that the lamp lights up?

• A. Close the switch

• B. Add another wire

• C. Add another bulb or lamp

• D. Add a battery and close the switch

Which switch must be closed to make the lamp light?

• A. Only switch 1

• B. Only switch 2

• C. Switch 1 and 2

• D. The lamp can still light up even the switches are open

9. What is a circuit?

• A. Provides electricity to the load

• B. poor electrical conductor

• C. path where electricity can flow

• D. switch and a conductor

10. Where does an electric current flow?

• A. in an open circuit

• B. broken circuit

• C. in a closed circuit

• D. in a busted bulb