Find the resistance of the wire (in kΩ) through which a 5 mA current flows when 500 V of potential difference is applied across it.
100
The correct answer is 100.
Key Points
- The resistance of the wire is 100 kΩ.
- The formula for calculating resistance is: R = V/I
- Here, we are given the potential difference (V) and current (I), so we can calculate the resistance as follows:
R = 500/ 5 x 10-3 (since the current is given in milliamperes and 'milli' refers to 10-3)
R = 100 x 103 Ω
R = 100 kΩ (since 103 refers to 'kilo').
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