Tap 108- 2: Introductory questions on resistance




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TAP 108- 2: Introductory questions on resistance
1. Convert the following:

(a) 12 500 Ω to kΩ

(b) 0.025 kΩ to Ω
2. A 240 V lamp draws a current of 0.50 A from the mains supply. What is the resistance of the lamp?
3. What current flows through a 12 V lamp when its filament has a resistance of 100 ? Give your answer in amps and milliamps.

4. A current of 4.0 mA flows through a fine piece of resistance wire when the potential difference across it is 8.0 V. What is the resistance of the wire?


5. A 5000 V EHT supply is protected by a 5 mega-ohm (5 M) resistor in series with its positive terminal. What is the maximum current that can be drawn from this supply if its terminals are shorted? (Ignore its internal resistance)

Answers

1 (a) 12.5 Ωk (b) 25 Ω


2. 480 Ω
3. 0.12 A or 120 mA
4. 2000  or 2.0 k
5. 0.001 A or 1.0 mA


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