Advertisements
Advertisements
Question
What is the current in a circuit if the charge passing each point is 20 C in 40 s?
Advertisements
Solution
Here:
Charge, Q = 20 C
Time, t = 40 s
We know that, I = Q/t.
So:
I = 20/40 = 0.5 A
Therefore, the electric current flowing through the circuit is 0.5 A.
APPEARS IN
RELATED QUESTIONS
What does an electric circuit mean?
Which instrument is used to measure electric current? How should it be connected in a circuit?
A flash of lighting carries 10 C of charge which flows for 0.01 s. What is the current? If the voltage is 10 MV, what is the energy?
How many electrons are flowing per second past a point in a circuit in which there is a current of 5 amp?
A car headlight bulb working on a 12 V car battery draws a current of 0.5 A. The resistance of the light bulb is:
(a) 0.5 Ω
(b) 6 Ω
(c) 12 Ω
(d) 24 Ω
A battery and three lamps are connected as shown:
Which of the following statements about the currents at X, Y and Z is correct?
(a) The current at Z is greater than that at Y.
(b) The current at Y is greater than that at Z.
(c) The current at X equals the current at Y.
(d) The current at X equals the current at Z.
Consider the circuit given below:
(a) In which circuit are the lamps dimmest?
(b) In which circuit or circuits are the lamps of equal brightness to the lamps in circuit (i)?
(c) Which circuit gives out the maximum light?
Draw a circuit diagram showing two lamps, one cell and a switch connected in series.
How can you change the brightness of the lamp?
Calculate the equivalent resistance between A and B in the adjacent diagram.
A 720 W heater operates from a 220 V line voltage. Calculate:
(a) The electrical energy consumed by the heater in 3 h.
(b) The cost of electrical energy consumption at the rate of 60 paise per kWh.
Complete the following sentence:
A fuse is connected in ........... with the ......... wire.
The diagram shows two ways of connecting three lamps P, Q and R to A.C. supply of 220 V.
Find the effective resistance in the following circuit diagrams (Fig.):
Tick (✓) the correct choice among the following :
There are 500 turns and 2000 turns in the primary and secondary coil of a
transformer respectively. If th e output voltage is 1000 V, how large is the
input voltage?
State the conditions for the flow of charge in a circuit from one point to the other.
