For a heater rated at 4kW and 220V, calculate:
(a) the current,
(b) the resistance of the heater,
(c) the energy consumed in 2 hours, and
(d) the cost if 1kWh is priced at Rs 4.60.

An electric heater takes 6A current from a 230V supply line, calculate the power of the heater and electric energy consumed by it in 5 hours.

The rating of an electric heater is1100 w, 220V calculate the resistance when it operates at 220 v, also calculate the energy consumed in kwh in the month of November, if the heater is used daily for 4 hours at the rated voltage.

An electric heater has a rating of 3 kW, 220 V . Calculate the following (i) Current. (ii) Resistance offered by the heater. (iii) Cost of running the heate for 10 hours at the rate of ₹ 3.50 per unit.

A tourch bulb is rated at 3 V and 600 mA. Calculate a) Power b) Resistance c) Energy consumed if it is used for 4 hour.

An electric current of 8 A is made to flow through a room heater of resistance 30 omega . Calculate (1) the potential difference across the heater. (2) the power supplied to the heater. (3) the amount of heat energy liberated from it in one minute. (4) If the heater is used for 10 hours daily in the months of December, then find the num ber of units of electrical energy consumed by it.