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Electricity
Objectives
- To understand how electricity makes machines work.
- To understand that certain noise-making machines work using electricity.
Resources
D cells | Small motor | Card | Buzzer | Assignment 7
Today's Lesson
Main Activity
A buzzer is another component of a circuit. A buzzer needs a stronger supply of electricity than a bulb. The strength of electricity is measured in volts (v). The strength of electricity that a component needs to work is called the voltage.
Ask your child to create a circuit from the beginning and wire up the buzzer. By this stage, they should have no difficulty in completing a circuit. You may need a 3V cell to make a 3V buzzer work. This can be achieved by joining two 1.5V cells. Test your circuit and if necessary, add a third cell.
Next, as they did in the previous lesson with the motor, ask them to go around the house and list any items they can find which need a buzzer. Ask your child to think of a possible use for a buzzer in your house, where there is currently no buzzer. Why can buzzers be useful? Where do we use buzzers in real life? Make a list and keep adding to it as you find more examples.
(Suggestions include: Buzzers to indicate when a door has been opened (like in a shop); Fire detectors/smoke alarms; Alarms/computers/appliances.)
Assignment
Please ask your child to complete Assignment 7.