Advertisements
Advertisements
प्रश्न
List the names of three electrical gadgets used in your house. Write their power, voltage rating and approximate time for which each one is used in a day. Hence, find the electrical energy consumed by each in a day.
Advertisements
उत्तर
| Appliance | Power (in watts) |
Voltage (in volts) |
Time (hours) |
Electrical energy (E = p × t) |
| Fluorescent tube | 40 | 220 | 12 | 0.48 kWh |
| Television set | 120 | 220 | 4 | 0.48 kWh |
| Refrigerator | 150 | 220 | 24 | 3.6 kWh |
APPEARS IN
संबंधित प्रश्न
Define watt-hour. How many joules are equal to 1 watt-hour?
A geyser is rated 1500 W, 250 V. This geyer is connected to 250 V mains. Calculate:
(i) the current drawn
(ii) the energy consumed in 50 hours, and
(iii) the cost of energy consumed at Rs. 4.20 per kWh
A simple electric circuit has a 30 V battery and a resistor ot 60 o. What will be the current in the circuit? The resistance of the oonnecting wires is negligible.
An electric bulb of resistance 500 Ω draws current 0.4 A from the source. Calculate:
- the power of bulb and
- the potential difference at its end.
What does the unit kilowatt hour measure? Define it.
How is the amount of heat produced calculated due to the passage of current in a metallic conductor? Derive an expression for it.
I ampere of current is passed through a resistor of resistance R ohm for time t second. Obtain expression for
(i) the electrical energy, and
(ii) the electrical power spent.
An electric lamp A of 40 W and another electric lamp B of 100 W are connected to 220 V supply. Calculate the ratio of their filament resistances?
A battery of e.m.f. 12V and internal resistance 1.6 Ω is connected to two resistors of 4Ω and 6Ω connected in parallel. Calculate:
(i) the current drawn from the battery,
(ii) the power dissipated in each resistor,
(ii)the total power supplied by the battery.
Electric power is inversely proportional to ____________.
