9.4 Practical Circuits

• Physics
• Secondary Education
• Age 12,13

03 May 2023

Unit 9.4 Practical Circuits

Content objectives

• I can draw a circuit symbol for a variable resistor.
• I can explain how a variable resistor is used in a circuit.
• I can compare circuit diagrams that contain cells, switches,  fixed resistors, ammeters, voltmeters, lamps, and buzzers. 

What have I learned?

• Draw the circuit symbol for each component: cell, switch, resistor, ammeter, voltmeter, lamp, and buzzer.
• Beside each symbol, write the function of each component.
• Describe, in words or with a diagram, how to connect a voltmeter to measure the voltage across a lamp; an ammeter to measure the current through a resistor.

Activity 1

Which component is used to change the resistance in a circuit?

1. fixed resistor
2. variable resistor

Variable Resistors

• a component used to change the resistance in a circuit

Which of the following is the circuit symbol for a fixed resistor?

Example

• A diagram that shows a variable resistor controls the brightness of a lamp.

?

Example

• A diagram that shows a variable resistor controls the brightness of a lamp.

Name at least two objects you use that use electric circuits.

How does fridge light work?

How does a buzzer work?

How does this circuit work?

Can you use a 6V lamp using a 12V battery?

Yes

No

Can you use a 6V lamp using a 12V battery?

Write one thing you learned today.

Practice Activity

What's next?