Question

State the commercial unit of electrical energy and find its SI unit.

The current through a resistor is made three times its initial value. Calculate how it will affect the heat produce in the resistor.

Find the increase in the amount of heat generated in conductor if another conductor of double resistance is connected in the circuit keeping all other factors unchanged.

Rita uses an electric iron rated 220 V, 1000 W to iron clothes every day for 1 hour. She wants to know how much energy the iron consumes and how much it costs her if the electricity rate is ₹6 per unit.