Electricity numericals 2

A current 1.5 A is drawn by an electric bulb for 10 min, then the amount of electric charge is

• 300 C

• 400 C

• 900 C

• 1000 C

A charge of 500 C flows through a bulb for 5 min, then the amount of current flowing through the circuit is

• 20 A

• 500 A

• 10 A

• 1.6 A

Work of 24 J is done in a moving 4 C ( coulomb )of charge between two points on a conductor wire , then the potential difference between two points is

• 24 V

• 6 V

• 0.6 V

• 14 V

In the given circuit, value of R is

• 12 Ω

• 14 Ω

• 2 Ω

• 4 Ω

In the given combination of resistance , the effective resistance across A and B

• 5 Ω

• 7 Ω

• 13 Ω

• 16 Ω

The electrical resistivity of silver is 1.60 x 10-6 m what will be the resistance of silver wire of length 2 m and cross section 2 x 10 -3 m2 ?

• 8 x 10 -3 Ω

• 1 x 10-3 Ω

• 6 x 10-3 Ω

• 1.60 x 10 -3 Ω

An electric bulb is connected to a 240 V generator , The current drawn is 0.25 A. Then the power of the bulb is

• 60 W

• 600 W

• 0.6 W

• 24 W

An electric iron of resistance 20 Ω and takes current of 5 A, then the Heat developed in 30 seconds

• 25000 J

• 15000 J

• 1500 J

• 2500 J

A bulb marked 220 V, 40 W, calculate current flowing through the bulb and its resistance

• 1210 ohm, 0.18 A

• 1200 ohm, 1.8 A

• 121 ohm, 0.18 A

• 1200 ohm, 0.18 A

An electric iron box rated 750 W Operated for 2 hours per day, if the cost of unit Is Rs 3.00 per kWh, then the cost of energy used to operate electric iron box for 30 days is

• Rs 125

• Rs 308

• Rs 135

• Rs 185