1. If a current ‘I’ flows …

1. If a current ‘I’ flows through a conductor of resistor ‘R’ on applying a potential difference ‘V’, how much power is available in the circuit? Write various formulas for power. Also if the circuit remains on for a time ‘t’, how much heat will be developed across the resistor? Write various formulas for the same. 2. How are voltmeters and ammeters connected in any electrical circuit? Why? What values do they measure in the circuit? 3. (a) Draw the nature of the V-I graph for a nichrome wire. (b) A metallic wire of 625 mm length offers a 4 Ω resistance. If the resistivity of the metal is 4.8 x 10-7 ohm-meter then calculate the area of cross-section of the wire. 4. An electric heater rated 800 W operates 6h/day. Find the cost of energy to operate it for 30 days at Rs. 3.00 per unit.

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