When a 40V battery is connected across an unknown resistor there is a current of 100 mA in the circuit. Find the value of the resistance of the resister:
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voltage - 40 volts (V)
current - 100 MA(I)
100× 1000 A
100×10³A
V=IR
R=V/I
40/100×10³
40×1000/100
400 ohm
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