Find the value of resistance of a resistor with resistivity =2 X 10 -2 ohm- m length = 200cm and cross sectional area = 4 X 10 -2 m 2 .
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If you know the total current and the voltage across the whole circuit, you can find the total resistance using Ohm's Law: R = V / I. For example, a parallel circuit has a voltage of 9 volts and total current of 3 amps. The total resistance RT = 9 volts / 3 amps = 3 Ω.
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