Calculate the heat produced per second by an electric heater connected to 240 V mains and carrying a current of 4A.

Calculate the heat produced in calorie when a current of 0.1 A is passed through a wire of resistance 41.8 ohm for 5 minutes.

Calculate the heat produced in calorie when a current of 0.2 A is passed through a wire of resistance 41.8 ohm for 10 minutes

Solve the following examples/ numerical problems. Calculate the heat produced in calorie when a current of 0.1 A is passed through a wire of resistance 41.8 ohm for 10 minutes.

Calculate the heat generated in a coil of resistance 40 'omega' in joule, if a current of 40 A flows through it for 1 minute 30 second.

A transformer has 250 volts applied to the primary and gives 4.6V in the secondary. The secondary is connected to a load which draws a current of 5A. The current in the primary is

A tuning fork C procues 8 beats per second with another tuning f+ork D of frequency 340 Hz . When the prongs of tuning fork C are filled a little, the number of beats produced per second decreases to 4 . Find the frequency of the tuning fork C before filing its prongs.

Solve the following examples/ numerical problems. A potential differnce of 250 volts is applied across a resistance of 1000 ohm in an electric iron. Find (1) the current (2) the heat produced in joule in 12 seconds. Keeping other conditions the same, if the length of the wire in the iron is reduced to half the original length ( by cutting the wire), what will be the current and heat produced?

Calculate the heat generated in joule in a coil when potential difference of 30 volts is applied across it. The current of 0.8 A is passed for 4 minutes.

Give Scientific reasons: In the electric equipment's producing heat e.g. iron, electric heater, boilers, toaster etc. and alloy such as Nichrome is used, not pure metal