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
Which of the two is connected in series : ammeter or voltmeter?
If the amount of electric charge passing through a conductor in 10 minutes is 300 C, the current flowing is:
(a) 30 A
(b) 0.3 A
(c) 0.5 A
(d) 5 A
The lamps in a house hold circuit are connected in parallel because:
(a) this way they required less current
(b) if one lamp fails the others remain lit
(c) this way they require less power
(d) if one lamp fails the other also fail
How does the heat H produced by a current passing through a fixed resistance wire depend on magnitude of current I?
Which effect of current is utilised in the working of an electric fuse?
Electrical power P is given by the expression P = (Q × V) ÷ time
(a) What do the symbols Q and V represent?
(b) Express the power P in terms of current and resistance explaining the meanings of symbols used there in.
A bulb of 40 W is used for 12.5 h each day for 30 days. Calculate the electrical energy consumed.
An electric bulb is rated 250 W, 230 V.
- the energy consumed in one hour, and
- the time in which the bulb will consume 1.0 kWh energy when connected to 230 V mains.
