Electricity, Numerical problems

The filament of an electric bulb ,which draws a current of 0.25 A is used for two hour. Calculate the amount of charge flowing through the circuit

• 1200 C

• 2500 C

• 900 C

• 1800 C

If the amount of electric charge passing through a conductor in 4 minutes is 500 C, then the current flowing is

• 1.8 A

• 2 A

• 0.8 A

• 0.2 A

Work done in moving a charge of 4 C across two points having a potential difference 6 V is

• 1.5 J

• 10 J

• 24 J

• 2.4 J

When 6 V battery is connected across an unknown resistor, there is a current of 1.5 A in the circuit, then the value of resistance is

• 3 Ω

• 2 Ω

• 4 Ω

• 8 Ω

The three resistor of resistance 2 Ω, 4 Ω , 6 Ω are connected in series then their effective resistance is

• 0.9 Ω

• 14 Ω

• 9 Ω

• 12 Ω

The three resistor of resistance 2 Ω, 3 Ω , 6 Ω are connected in parallel then their effective resistance is

• 11 Ω

• 9 Ω

• 1 Ω

• 4 Ω

The resistance of conductor is 27 Ω , if it is cut into three equal parts and connected in parallel, then the total resistance is

• 6 Ω

• 3 Ω

• 9 Ω

• 27 Ω

200 J of heat is produced each second in a 2 Ω resistance, then the current in the circuit is

• 10 A

• 5 A

• 14 A

• 15 A

An electric motor takes 5 A from 220 V line, then the power of electric motor is

• 1000 W

• 900 W

• 1100 W

• 750 W

An electric heater is rated 4 kWh, electrical energy cost Rs 4 per kWh, what is the cost of using the heater for 2 hours?

• Rs 16

• Rs 32

• Rs 18

• Rs 10