Advertisements
Advertisements
प्रश्न
An Electric bulb is marked 100 W, 230 V. What current does it take?
Advertisements
उत्तर
Current flowing in bulb = i = `"P"/"V"`
`= 100/230 = 10/23 "A" = 0.435` A
संबंधित प्रश्न
What determines the rate at which energy is delivered by a current?
Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?
How many joules of electrical energy are transferred per second by a 6 V; 0.5 A lamp?
(a) 30 J/s
(b) 12 J/s
(c) 0.83 J/s
(d) 3 J/s
Which cable, one rated 15A and the other rated 5A will be thicker? Give a reason.
Why does not the heating coil produce any visible light? in an electric stove.
State (i) the S. I. unit, (ii) the household unit, of electrical energy. How are these units related?
Find the heat produced in joules when a current of 10 amperes flows through a connecting wire of resistance 2 × 10-2 ohms and heating element of resistance 250 ohms for 2 seconds.
A battery of e.m.f. 12V and internal resistance 1.6 Ω is connected to two resistors of 4Ω and 6Ω connected in parallel. Calculate:
(i) the current drawn from the battery,
(ii) the power dissipated in each resistor,
(ii)the total power supplied by the battery.
What is the commercial unit of electrical energy?
What is the meaning of electric power of an electrical device? Write its SI unit.
