1.
The power of a heater is the rate at which it converts electrical energy into heat energy. It is given by the formula:
P = I^2R
where P is the power in watts, I is the current in amps, and R is the resistance in ohms.
In this problem, the power of the heater is 1000 W, and the voltage is 220 V. We can find the current by dividing the power by the voltage:
I = \frac{P}{V} = \frac{1000 W}{220 V} = 4.54 A
The resistance of the heater can be found by using the equation for power:
R = \frac{P}{I^2} = \frac{1000 W}{(4.54 A)^2} = 6.64 \Omega
2.
The phenomenon of a coil of insulated copper wire becoming a magnet when an electric current is passed through it is known as electromagnetic induction. This is the basis of the operation of many electrical devices, such as
