The photograph shows a small generator - Edexcel - GCSE Physics - Question 5 - 2012 - Paper 1
Question 5
The photograph shows a small generator.
When the handle is turned the current produced lights a lamp.
(a) (i) Complete the sentence by putting a cross (X) in the bo... show full transcript
Worked Solution & Example Answer:The photograph shows a small generator - Edexcel - GCSE Physics - Question 5 - 2012 - Paper 1
Step 1
Complete the sentence by putting a cross (X) in the box next to your answer.
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Answer
The current produced is usually alternating in direction (D). This is typical for generators, as they convert mechanical energy into electrical energy by creating alternating current (AC).
Step 2
State the unit in which electric current is usually measured.
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Answer
The unit in which electric current is usually measured is the ampere (A).
Step 3
Describe what happens inside the generator to produce the current.
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Answer
Inside the generator, a coil of wire rotates within a magnetic field. This motion induces an electromotive force (EMF) according to Faraday's law of electromagnetic induction. As the coil rotates, it cuts through the magnetic lines of force, producing an alternating current due to the changing direction of the magnetic field relative to the coil. This induced current flows through the circuit, powering the lamp.
