Simple circuits

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Question 31

Medium

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

A schematic diagram of an electrical circuit. At the top, there is a 9.0 V battery. The circuit is a single loop. From the battery, the wire goes down to the left, passes through a resistor on the bottom-left wire, and then continues to a lamp on the bottom-right wire. There is a switch connected in parallel across the lamp, shown in an open position.

The resistor has a resistance of $Ω12.0\ \Omega$ and the lamp has a resistance of $Ω6.0\ \Omega$ , so that the total resistance in the circuit when the switch is open is $Ω18.0\ \Omega$ .

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

Current = _________________ A

[3]

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

Potential difference = _________________ V

[1]

The switch is now closed.

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

[2]

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

[2]

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

Potential difference = _________________ V

[1]

Simple circuits

Question 31

Simple circuits Questions

Simple circuits

Question 31

Simple circuits Questions