# StudySquare

# AQA A-level Physics Series circuits

This page covers the following topics:

In a series circuit, the current at any point will be equal. As more lamps are added to a circuit, their brightness will decrease as less current will flow through them, although the current in the circuit will still be the same everywhere. If a component in a series circuit breaks, the circuit will become an open one and current will not flow.

In a series circuit, the total potential difference is equal to the sum of the potential differences across each component of the circuit. This is usually equal to the voltage of the cell or battery of the circuit.

The total resistance in the circuit will be the sum of all the individual resistances of the components.

All equations for the current, potential difference and resistance in a series circuit can be used together for calculations.

# 1

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A circuit is made up of a cell, a resistor, an ammeter and a lamp connected in series. Explain what the value on the ammeter will be if the lamp breaks.

# 2

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Three lamps are connected in series with a cell. Mary wants to increase the brightness of the circuit. Explain how she can do this, given that she has no other equipment to use.

# 3

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Describe how the voltage of the cell of a series circuit is shared between the components of the circuit.

# 6

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A variable resistor is connected in series with a cell and a fixed resistor of resistance 12 Ω. Given that the total resistance of the circuit is 20 Ω, calculate the resistance of the variable resistor.

# 7

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A battery is connected in series with a resistor of resistance 15 Ω and a second resistance of unknown value. Given that the total resistance in the circuit is 22 Ω, calculate the unknown resistance.

# 8

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Given that the total resistance in the circuit is 20 Ω, calculate the individual resistances of the resistors.

# 9

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Two resistors of resistance 15 Ω and 20 Ω respectively are connected in series to a cell. Given that the current through each resistor is 2.2 A, calculate the potential difference across the cell.

# 10

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A cell of voltage 10 V is connected in series with a lamp and a 3 Ω resistor. Given that the current in the circuit is 1.2 A, calculate the potential difference across the lamp.

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