Electricity Topic
Electromagnet
This science revision note aims to help your child
– understand what happens when the switch is closed (You need to understand the sequence of events that will happen when the switch is closed)
– How does the iron rod become an electromagnet?
– proper scientific keywords to explain the concepts clearly.
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Ben sets up an electrical circuit as shown below.
When Ben closed the switch, the hammer hits the gong. Explain why.
Note: You need to understand the sequence of events.
STEP 1
What does closing the switch do to the circuit?
When the switch is closed, the circuit is closed, so electric current can flow through the circuit.
STEP 2
What happens when electricity flows through the circuit?
The iron rod gets magnetised to become an electromagnet.
STEP 3
What does the electromagnet do?
The electromagnet attracts the soft iron strip. This causes the hammer to hit the gong, making it ring.
FINALLY, put your answer together
When Ben closed the switch, the hammer hits the gong. Explain why.
Answer:
When the switch is closed, the circuit is closed, so electric current can flow through the circuit. The iron rod gets magnetised to become an electromagnet. The electromagnet attracts the soft iron strip. This causes the hammer to hit the gong.
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Andy Ling
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