Advertisements
Advertisements
प्रश्न
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.
Advertisements
उत्तर
Here, V = 220 V and I = 0.5 A
(given)
Power drawn by the device is given by:
P = VI
Therefore:
P = 220 x 0.5
= 110 W
APPEARS IN
संबंधित प्रश्न
State two factors on which the electrical energy consumed by an electrical appliance depends.
When a current of 4.0 A passes through a certain resistor for 10 minutes, 2.88 × 104 J of heat are produced. Calculate
the power of the resistor.
the voltage across the resistor.
A bulb of 40 W is used for 12.5 h each day for 30 days. Calculate the electrical energy consumed.
A resistor of resistance R is connected to an ideal battery. If the value of R is decreased, the power dissipated in the resistor will ______________ .
What is the current in the circuit shown (Fig. )
Tick(✓) the correct choice in the following:
In the circuit shown in the following fig, the e.m.f. of the cell is 4 volts, the current
flowing through the resistor is
Two resistors A and B of 4 Ω and 6 Ω respectively are connected in parallel. The combination is connected across a 6 volt battery of negligible resistance. Calculate the power supplied by the battery.
An electric iron rated 750 W is operated for 2 hours/day. How much energy is consumed by the electric iron for 30 days?
An electric current is passed through a metallic wire. The wire gets heated up. Give the reason. Is it possible to melt the wire by passing a heavy current?
What are the two main systems of wiring commonly used in houses? Which of these systems mentioned by you is better and why?
What changes in energy occur in an electric heater?
‘The current rating of a fuse is 5A’. Comment on this statement.
Which material is the calorimeter commonly made of? Give one reason for using this material.
How does the heat produced by die passage of current in a metallic wire depend on the time of passage of current in the wire?
State the reason why, in a three pin plug, the earth pin is longer and thicker than the other two.
At what voltage is the electric power generated at the generating station? Explain the transmission of this power to your house.
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 joule.
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.
1 mV is equal to:
What is the commercial unit of electrical energy?
