Advertisements
Advertisements
प्रश्न
How many joules of electrical energy are transferred per second by a 6 V; 0.5 A lamp?
(a) 30 J/s
(b) 12 J/s
(c) 0.83 J/s
(d) 3 J/s
Advertisements
उत्तर १
(d) 3 J / s
Electrical energy transferred per second,
`E=V xx I xx t =6Vxx0.5Axx1s=3 "J/s"`
उत्तर २
(d) 3 J / s
Electrical energy transferred per second,
`E=V xx I xx t =6Vxx0.5Axx1s=3 "J/s"`
उत्तर ३
(d) 3 J / s
Electrical energy transferred per second,
`E=V xx I xx t =6Vxx0.5Axx1s=3 "J/s"`
उत्तर ४
(d) 3 J / s
Electrical energy transferred per second,
`E=V xx I xx t =6Vxx0.5Axx1s=3 "J/s"`
उत्तर ५
(d) 3 J / s
Electrical energy transferred per second,
`E=V xx I xx t =6Vxx0.5Axx1s=3 "J/s"`
उत्तर ६
(d) 3 J / s
Electrical energy transferred per second,
`E=V xx I xx t =6Vxx0.5Axx1s=3 "J/s"`
उत्तर ७
(d) 3 J / s
Electrical energy transferred per second,
`E=V xx I xx t =6Vxx0.5Axx1s=3 "J/s"`
उत्तर ८
(d) 3 J / s
Electrical energy transferred per second,
`E=V xx I xx t =6Vxx0.5Axx1s=3 "J/s"`
उत्तर ९
(d) 3 J / s
Electrical energy transferred per second,
`E=V xx I xx t =6Vxx0.5Axx1s=3 "J/s"`
APPEARS IN
संबंधित प्रश्न
What determines the rate at which energy is delivered by a current?
An electric bulb is connected to a 220 V power supply line. If the bulb draws a current of 0.5 A, calculate the power of the bulb.
An electric motor takes 5 amperes current form a 220 volt supply line. Calculate the power of the motor and electric energy consumed by it in 2 hours.
How many joules are there in one kilowatt-hour?
1kWh = …….. J
An electric bulb marked 220 V, 100 W will get fused if it is made to consume 150 W or more. What voltage fluctuation will the bulb withstand?
A simple electric circuit has 24 V battery and a resistor of 60 Ω. What will be the current in the circuit? The resistance of the connecting wires is negligible.
An electric heater is rated 220 V, 550 W. Calculate the electrical energy consumed in 3 hours?
At what voltage is the electric power generated at the generating station? Explain the transmission of this power to your house.
An electric bulb is rated 240V-60W and is working at 100% efficiency.
(i) Calculate the resistance of bulb.
(ii) (a) Draw the circuit diagram.
(b) What is the rate of conversion of energy in each bulb?
(c) Total power used by the bulbs.
Find the energy released by a current of 0.25 amperes flowing through a heater for 5 minutes. The p.d. is 230 V.
The resistance of filament of an electric heater is 500 Ω It is operated at 200V for 1 hour daily. Calculate the current drawn by the heater and the energy consumed in kWh, by the heater in a month of 30 days.
A torch bulb is rated at 3 V and 600 mA. Calculate it’s
- power
- resistance
- energy consumed if it is used for 4 hours.
Unit of electric power may also be expressed as:
Compare the power used in the 2 Ω resistor in each of the following circuits:
- a 6 V battery in series with 1 Ω and 2 Ω resistors
- a 4 V battery in parallel with 12 Ω and 2 Ω resistors.
A student wants to use an electric heater, an electric bulb and an electric fan simultaneously.
How should these gadgets be connected with the mains? Justify your answer giving three reasons.
In the given figure, the emf of the cell is 2.2 V, and if internal resistance is 0.6 Ω. Calculate the power dissipated in the whole circuit.
