# 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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