Advertisements
Advertisements
Question
The p.d. across a 3 Ω resistor is 6 V. The current flowing in the resistor will be:
(a) `1/2A`
(b) 1 A
(c) 2 A
(d) 6 A
Advertisements
Solution
(c) 2 A
If the p.d. across a 3 Ω resistor is 6 V, the current flowing in the resistor will be 2 A as current (I) is given by the equation, I = V (Voltage) / R (Resistance).
or I = V/R
I = 6 V/3 Ω
I = 2 A
APPEARS IN
RELATED QUESTIONS
One coulomb charge is equivalent to the charge contained in:
(a) 2.6 × 1019 electrons
(b) 6.2 × 1019 electrons
(c) 2.65 × 1018 electrons
(d) 6.25 × 1018 electrons
By what name is the physical quantity coulomb/second called?
Which of the following equation shows the correct relationship between electrical unit?
1A = 1C/s or 1c= 1A/s
The circuit diagram given below shows the combination of three resistors R1, R2 and R3:
Find :
(i) total resistance of the circuit.
(ii) total current flowing in the circuit.
(iii) the potential difference across R1.
Calculate the equivalent resistance between A and B in the adjacent diagram.
Distinguish between an open and a closed circuit.
A bulb marked 12 V, 24 W operates on a 12 volt car battery for 20 minutes. Calculate:
(i) The current flowing through it, and
(ii) The energy liberated.
Explain with the help of a diagram how does 'short circuiting' occur in an electric kettle.
An electric iron is rated 750 W, 230 V. Calculate the electrical energy consumed by the press in 16 hours.
At the time of short circuit, the electric current in the circuit ______.
Explain, why the potential difference across the terminals of a cell is more when the cell is not in use than it is when the cell is being used.
Which part of an electrical appliance is earthed?
An electric bulb is marked 100 W, 250 V. How much current will the bulb draw if connected to a 250 V supply?
What is the speed of electric current?
Give the electric current unit.
Kilowatt hour is the unit of
Match the items in column-I to the items in column-II:
| Column - I | Column - II | ||
| (i) | electric current | (a) | volt |
| (ii) | potential difference | (b) | ohm meter |
| (iii) | specific resistance | (c) | watt |
| (iv) | electrical power | (d) | joule |
| (v) | electrical energy | (e) | ampere |
A charge of 400C flows through a conductor for 13 minutes and 20 seconds. Find the magnitude of the current flowing through the conductor.
