Advertisements
Advertisements
प्रश्न
A bulb marked 12 V, 24 W operates on a 12 V battery for 20 minutes. Calculate:
- The current flowing through it, and
- The energy consumed.
Advertisements
उत्तर
Given Power, P = 24 W
Voltage, V = 12 V
Current, I = ?
As power, P = VI
- I = `24/12
= 2 "A"` - Energy, E = P × t
E = 24 × 20 × 60 sec
E = 28800 J
APPEARS IN
संबंधित प्रश्न
In 10 s, charge of 25 C leaves a battery, and 200 J of energy are delivered to an outside circuit a result.
What is the p.d. across the battery?
One coulomb of charge flows through any cross-section of a conductor in 1 second. What is the current flowing through the conductor?
Two resistors of 2.0 Ω and 3.0 Ω are connected (a) in series (b) in parallel, with a battery of 6.0 V and negligible internal resistance. For each case draw a circuit diagram and calculate the current through the battery.
A cell supplies a current of 1.2 A through two 2 Ω resistors connected in parallel. When the resistors are connected in series, it supplies a current of 0.4 A. Calculate:
(i) the internal resistance and (ii) e.m.f. of the cell.
If the potential differences between two parts of a thundercloud is 10s V,
what is the amount of energy given up during the passage of 20 coulombs?
(a)2x10-7J
(b)200J
(c)Sx106 j
(d)2x 109J
(e)2x 1010 J
State whether the current is a scalar or vector?
A current of 0.2 A flows through a wire whose ends are at a potential difference of 15 V. Calculate:
(i) The resistance of the wire, and
(ii) The heat energy produced in 1 minute.
Which part of an electrical appliance is earthed?
Water : pipe :: Electric current : ______.
Problems for practice:
If 5A current flows through a circuit, then convert the current in terms of microampere?
