P3 Electricity Quiz

What do you think will happen?

How would you explain this?

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Two batteries and a bulb are connected like this.

What will happen when this is connected?

How would you explain this?

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The three bulbs in this circuit are identical. a How bright will the bulbs be?

Choose one from:

• All the bulbs are lit with the same brightness.

• Bulb 1 is brightest, then bulb 2, and bulb 3 is dimmest.

• Bulb 3 is brightest, then bulb 2, and bulb 1 is dimmest.

• Bulbs 1 and 3 are bright. Bulb 2 is dimmer.

• Bulbs 1 and 3 are dim. Bulb 2 is brighter.

A bulb is connected to a battery.

The bulb is lit.

Which of the following best describes the electric current in this circuit?

• There is an electric current through one wire to the bulb. It is all used up in the bulb. So there is no current in the other wire.

• There is an electric current through one wire to the bulb. Some of it is used up in the bulb. So there is a smaller current in the other wire.

• There is an electric current through one wire to the bulb. It passes through the bulb and back to the battery. The current in the other wire is the same size.

• There are two electric currents from the battery to the bulb. They meet at the bulb and this is what makes it light.

Lydia is comparing series and parallel circuits in a class practical.

Lydia switches on both circuits.

Which one is correct?

• The reading on A₁ is less than the reading on A₂.

• The total resistance in circuit B is 6 Ω.

• The p.d. across the 8 Ω is the same in both circuits.

• The p.d. across A₂ is very large

Lydia is comparing series and parallel circuits in a class practical.

Lydia replaces the 4 Ω resistor with a 6 Ω resistor in each circuit.

Lydia switches on both circuits.

Which one is correct?

• The current from the

  battery decreases for Circuit A

• The current from the

  battery increases for Circuit B

• The current from the

  battery doesn't change for both circuits.

Tim also connects resistors in series and parallel.

He sets up this series circuit.

Calculate the resistance of R₁.

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Tim also connects resistors in series and parallel.

He sets up this series circuit.

What is the voltage across R₂?

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He sets up this parallel circuit.

What is the voltage between points X and Y?

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He sets up this parallel circuit.

All the resistors have the same resistance.

What is the current through point Z?

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