Advertisements
Advertisements
Question
If a bulb of 60W is connected across a source of 220V, find the current drawn by it.
Advertisements
Solution
Power P = 60W, Voltage V = 220. To find eye ?
We have current `I = P/V = 60/220= 0.272 A`
APPEARS IN
RELATED QUESTIONS
What determines the rate at which energy is delivered by a current?
State two factors on which the electrical energy consumed by an electrical appliance depends.
Name the quantity whose unit is (i) kilowatt, and (ii) kilowatt-hour.
Which uses more energy: a 250 W TV set in 1 hour or a 1200 W toaster in 10 minutes?
The unit for expressing electric power is:
(a) volt
(b) joule
(c) coulomb
(d) watt
The SI unit of energy is :
(a) joule
(b) coulomb
(c) watt
(d) ohm-metre
Electrical power P is given by the expression P = (Q × V) ÷ time. What do the symbols Q and V represent?
A current of 2 A is passed through a coil of resistance 75Ω for 2 minutes. (a) How much heat energy is produced? (b) How much charge is passed through the resistance?
A current passes through a resistor. Let K1 and K2 represent the average kinetic energy of the conduction electrons and the metal ions, respectively.
Tick(✓) the correct choice in the following:
In the circuit shown in the following fig, the e.m.f. of the cell is 4 volts, the current
flowing through the resistor is
What changes in energy occur in an electric bulb?
Why does not the heating coil produce any visible light? in an electric stove.
Why is the electric power from the generating station transmitted at high voltage?
State the reason why, in a three pin plug, the earth pin is longer and thicker than the other two.
An Electric bulb is marked 100 W, 230 V. What find the energy consumed by the bulb in one hour.
An immersion rod having resistance of 50 Ω is connected to 220V main supply. Assuming that all the energy generated goes to heat the water, calculate the time taken to heat 5 kg water from 30°C to 100°C.
