Question

(a) Differentiate between AC and DC. Write any two points of difference.
(b) A person operates a microwave over of 2kW power rating in a domestic circuit of 220 V and current rating 5A. What result is expected? Explain with reason.
(C ) Write the frequency of AC and DC.

Answer 1

(a)
(b) Power of the oven, `P=2kW=2000 W`
Potential difference, `V = 220 "volt"`
Current, I = 5A
`therefore` Result will be:
`P=VxxI = 220 xx5=1100 "volt" A = 1100 W`
The show that microwave requires more electrical energy than the energy provided by the circuit. the microwave will not work and fuse wire will break due to overloading.
(c) The AC produced in India has a fruequency of 50 Hz, it means the current reverses its direction 100 times in a second.
DC always flows in one direction, it means polarity of direction current is fixed and it has no frequency.