Question

22. (a) Define electric power. A device of resistance R is connected across a source of V voltage and
draws a current I. Derive an expression for power in terms of voltage and resistance.
(c) An electric bulb is connected to a 200 V generator. The current is 0.5 A. What is the power of
the bulb ? (3)
Difine a calenoid with the help of a suitable diagram show the pattern of magnetic field lines​

Answer 1

Answer:

a) Electric power is simply the rate at which energy is transferred through a circuit.

b) P = I * V and I = V / R. Thus, V = I * R so P = I² * R

c) Here you want power from volts and amps. Thus, we use P = I * V to get 100 watts

d) Do you mean solenoid? A solenoid is a tube of wire that magnifies the EM field inside (think of the right hand rule).

https://www.miniphysics.com/ss-magnetic-field-due-to-current-in-a-solenoid.html

Next time don't add 4 questions to one question slot, it makes people not want to answer it (and also don't put it in the math section).