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Precautions While Using Electricity

Why frequency...

Question

Why frequency of DC circuit is 0?

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Solution

Because it takes infinite time to change its phase, or it is a steady value forever.

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what are the normal frequency of AC current delivered to our homes.do DC current also have some frequency is not so why

Obtain the answers (a) to (b) in Exercise 7.13 if the circuit is connected to a high frequency supply (240 V, 10 kHz). Hence, explain the statement that at very high frequency, an inductor in a circuit nearly amounts to an open circuit. How does an inductor behave in a dc circuit after the steady state?

Q. You are given many resistors, capacitors and inductors. These are connected to a variable DC voltage source (the first two circuits) or an AC voltage source of 50

H z

frequency (the next three circuits) in different ways as shown in Column II. When a current

I

(steady state for DC or rms for AC) flows through the circuit, the corresponding voltages

V_{1}

V_{2}

(indicated in circuits) are related as shown in Column I. Match the two columns. Column I Column II

i	$I \neq 0, V_{1} is proportional to I$	a
ii	$I \neq 0, V_{2} > V_{1}$	b
iii	$V_{1} = 0, V_{2} = V$	c
iv	$I \neq 0, V_{2} is proportional to I$	d
		e

Q. Transformers are used

(a) in DC circuits only
(b) in AC circuits only
(c) in both DC and AC circuits
(d) neither in DC nor in AC circuits

Q. Conceptual Questions
(a) Why does a capacitor act as a short circuit at high frequencies?
(b) Why does a capacitor act as an open circuit at low frequencies?

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