K.C.S.E Physics Q & A - MODEL 2011PP2QN07&8
Figure 5, shows a motor connected to a magnetic switch called a relay operated by an ordinary switch S1 Use the information in the figure to answer questions 7 and 8.
Explain how the relay switches on the motor when S1 is closed.
State with a reason the effect on the motor, the iron core is replaced with a steel core and switch S1 is put on and then off.
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