Monday, August 1, 2011

A few problems from Current electricity

1. A carbon resistor of 47 k ohms is to be marked in the colour code . Write the sequence of colours .

2. A toaster produces more heat than a light bulb when connected in parallel to the 220 V mains . Which of the two has greater resistance ?
3. A 0- 50 amp ammeter has been guaranteed accuracy of 2% of a full reading scale . The limiting percentage error when the meter is measuring 10 ampere is …… ?

[Posted by  George]

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