Question

20. Distinguish between kilowatt and kilowatt hour. For a heater rated at 4.4 kW; 220 V, calculate the:
i) current drawn by the heater. li) resistance of the heater element iii) energy consumed by the heater in 5 hours.
iv) cost of running the heater if 1kWh costs Rs. 6.50.
21. Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of 2 ohm in series with a
Combination of two resistors (4 Ohm) each in parallel and a voltmeter across the parallel combination. Will the
Potential difference across the 2 Ohm resistors be the same as that across the parallel combination of 4 Ohm
Resistors? Give reason.
22. Three incandescent bulbs of 100W each are connected in series in an electric circuit. In another set of three bulbs
Of the same wattage are connected in parallel to the same source.
a) Wirtire but in the two circuits glow with the same brightness
b) Now let one bulb in both the circuits get fused. Will the rest of the bulbs continue to glow in each circuit?
Give reason.​

Answer 1

Answer:

the energy use in 1 hour called kwh