Simple circuits

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Question 40
Medium

A student sets up an electrical circuit as shown in the diagram below.

An electrical circuit diagram displaying a 12.0 V battery at the top. The circuit contains a resistor rated at 4.0 ohms connected in series with a lamp rated at 8.0 ohms. A switch is connected in parallel across the lamp.

The resistor has a resistance of 4.0 Ω4.0\ \Omega4.0 Ω and the lamp has a resistance of 8.0 Ω8.0\ \Omega8.0 Ω, so the total resistance in the circuit when the switch is open is 12.0 Ω12.0\ \Omega12.0 Ω.

a.

Calculate the current in the circuit when the switch is open.

[2]
b.

State the potential difference across the resistor when the switch is open.

[1]
c.

The switch is now closed.

Describe how the current through the resistor changes. Explain your answer.

[2]
d.

Describe how the potential difference across the resistor changes. Explain your answer.

[2]
e.

State the potential difference across the lamp when the switch is closed.

[1]

Simple circuits Questions

  1. GCSE
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