electricity

What is a circuit?

• an outlet or switch
• a path which an electric current flows
• a poor conductor

What is a switch? 

• part of the toaster that you plug into the wall
• an outlet that gives power
• part of a circuit that starts or stops the electricity

Only one of the circuits below would work to light the light bulb. Choose the circuit below that would make the light bulb light up.

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What kind of circuit is this?

• Series
• Consecutive
• Parallel
• Training

Will the light bulb in this circuit light and why/why not?

• yes, because it has two batteries
• no, because the switch is open
• yes, because it is in a circuit
• no, because the bulb is burned out

The circuit diagram shows 3 light bulb in series. What happens when one of the light bulb blows.

• The remaining bulbs remain on.

• The remaining bulbs are off.

• The remaining bulbs becomes brighter.

• The remaining bulbs becomes dimmer.

Why is overloading a socket dangerous?

• It consumes too much electricity.

• A lot of energy is wasted.

• Over heating and fire may occur.

• The wires can become entangled.

What is the name of this electrical symbol?

• Variable voltmeter

• Variable resistor.

• Variable ammeter.

• Variable switch.

What physical quantity does voltmeter measures?

• Power

• Voltage

• Current

• Resistance

Look at figure 4. Ammeter A2 and A3 read the same value at 0.4Amps. What is the reading on Ammeter A1?

• 0.4A

• 0.2A

• 0.8A

• 0 A