Advertisements
Advertisements
प्रश्न
An electric bulb is rated at 220 V, 100 W.
- What is its resistance?
- What safe current can be passed through it?
Advertisements
उत्तर
- Given,
Power P = 100 W
Voltage V = 220 V
As power, P = `"V"^2/"R"`
R = `(220)^2/100`
= 484 Ω - The safe limit of current that can pass through it
I = `"P"/"V"`
I = `100/220`
= 0.45 A
APPEARS IN
संबंधित प्रश्न
A current of 4 A flows around a circuit for 10 s. How much charge flows past a point in the circuit in this time?
Why should the resistance of:
a voltmeter be very large?
If the charge on an electron is 1.6 × 10−19 coulombs, how many electrons should pass through a conductor in 1 second to constitute 1 ampere current?
Which statement/statement is/are correct?
1. An ammeter is connected in series in a circuit and a voltmeter is connected in parallel.
2. An ammeter has a high resistance.
3. A voltmeter has a low resistance.
(a) 1, 2, 3
(b) 1, 2
(c) 2, 3
(d) 1
If the lamps are both the same in the figure given below and if A1 reads 0.50 A, what do A2, A3, A4 and A5 read?
Define the term resistivity.
Distinguish between an open and a closed circuit.
Which part of an electrical appliance is earthed?
What are the effects of electric current?
