9.2 Current and voltage in Parallel circuits

• Physics
• Secondary Education
• Age 13

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Current and Voltage in Parallel Circuits

a) know about the different types of electric circuits.

b) be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

c) understand why schools and houses use parallel circuits more than series connections.

We are learning to:

October 16, 2025

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Starter video

Current vs Voltage

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

What is the difference between current and voltage?

Voltage is measured in ___________

1. volts
2. amps
3. ohms

What is the symbol for volts?

1. V
2. Vs
3. Vts
4. voltz

Voltage can be measured by a device called _________

1. ammeter
2. voltmeter
3. ohmmeter

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What is a voltmeter?

A voltmeter measures voltage.

Voltage is related to the ____________ energy supplied to a circuit by a cell, battery, or power supply.

1. potential energy
2. electrical energy
3. both A and B
4. static electricity

A cell has a usual voltage supply of ______

1. 1.5 V
2. 6 V
3. 9 V
4. 12 V

A battery of cells has a usual voltage supply of 6V, ___, and 9V.

1. 7 V
2. 8 V
3. 10 V
4. 12 V

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The sockets found on the walls of building supply a _______ voltage.

1. mains
2. power
3. rating
4. 1000V

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Mains, in this context, means an electrical supply that comes from a power station or a generator.

What is the mains voltage in Cambodia?

1. 110V
2. 220V
3. 230V
4. 240V

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The _____ is the source of energy in a circuit. It could be a cell, a battery of cells, or power supply or the mains.

1. Supply
2. Mains
3. Rating
4. Voltage

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Circuit symbols for the supply

A battery of two cells.

A battery of many cells.

A 240V mains supply

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Which of the following is the circuit symbol for the voltmeter?

1. 
2. 
3. 
4. 

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Actual circuit picture

Circuit diagram

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Voltage in series circuits

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

What do the circuit diagrams show about the voltage in a series circuit?

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Voltage in series circuits

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

What do the circuit diagrams show about the voltage in a series circuit?

Sound

Voltage in series circuits

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

What do the circuit diagrams show about the voltage in a series circuit?

Sound

Voltage in series circuits

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

What do the circuit diagrams show about the voltage in a series circuit?

Sound

Voltage in series circuits

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

What do the circuit diagrams show about the voltage in a series circuit?

Sound

Voltage in series circuits

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

What do the circuit diagrams show about the voltage in a series circuit?

Sound

Voltage in series circuits

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

What do the circuit diagrams show about the voltage in a series circuit?

Sound

Voltage in series circuits

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

What do the circuit diagrams show about the voltage in a series circuit?

Sound

Voltage in series circuits

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

What do the circuit diagrams show about the voltage in a series circuit?

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What happens to the VOLTAGE when you add more components to the series circuit?

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

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What happens to the CURRENT when you add more components to the series circuit?

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

What would you do to increase the current and voltage in a series circuit?

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Voltage in parallel circuits

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

Sound

Voltage in parallel circuits

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

What do the circuit diagrams show about the voltage in a parallel circuit?

Sound

Voltage in parallel circuits

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

What do the circuit diagrams show about the voltage in a parallel circuit?

Sound

Voltage in parallel circuits

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

What do the circuit diagrams show about the voltage in a parallel circuit?

Sound

Voltage in parallel circuits

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

What do the circuit diagrams show about the voltage in a parallel circuit?

Sound

Voltage in parallel circuits

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

What do the circuit diagrams show about the voltage in a parallel circuit?

Sound

Voltage in parallel circuits

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

What do the circuit diagrams show about the voltage in a parallel circuit?

Sound

Voltage in parallel circuits

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

What do the circuit diagrams show about the voltage in a parallel circuit?

Sound

Voltage in parallel circuits

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

What do the circuit diagrams show about the voltage in a parallel circuit?

Sound

What happens to the CURRENT when you add more components to the parallel circuit?

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

Sound

What happens to the CURRENT when you add more components to the parallel circuit?

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

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What happens to the CURRENT when you add more components to the parallel circuit?

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

Which is NOT an effect of adding more cells to a parallel circuit?

1. The voltage across each branch increases.
2. The current through the cell increases.
3. The current through each branch increases.
4. The voltage supply decreases.

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Group Practice (pp. 313-314)

Current and Voltage in Parallel Circuits

We are learning to be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

Team CL - Questions 1 and 2

Team SYBAU - Question 3

Team Top 1 - Question 4

Team CJ - Question 5

Team Penguins - Question 6

Share/present your work afterwards.

Top 1

CL

CJ

SYBAU

PENGUINS

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Parallel

circuits

a) know about the different types of electric circuits.

b) be able to show how current, voltage, and resistance are affected by the changes made to the electric circuit.

c) understand why schools and houses use parallel circuits more than series connections.

We are learning to:

October 14, 2025