Please select a subject first
Advertisements
Advertisements
Name the S.I. unit of electrical energy. How is it related to Wh?
Concept: undefined >> undefined
Name the S.I unit of electrical energy. How is it related to Wh?
Concept: undefined >> undefined
Advertisements
State the S.I. unit of electrical power.
Concept: undefined >> undefined
State and define the household unit of electricity.
Concept: undefined >> undefined
Name the physical quality which is measured in
(i) Kw (ii) kWh
Concept: undefined >> undefined
Distinguish between kilowatt and kilowatt-hour.
Concept: undefined >> undefined
1Kwh =`( 1 "volt "xx 1 am pere xx.............)/1000`
Concept: undefined >> undefined
An electric bulb is rated ‘100 W, 250 V’. What information does this convey?
Concept: undefined >> undefined
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.
Concept: undefined >> undefined
Two lamps, one rated 220 V, 50 W and the other rated 220 V, 100 W, are connected in serieswith mains of 220 V. Explain why does the 50 W lamp consume more power
Concept: undefined >> undefined
When a current I flows through a resistance R for time t, the electrical energy spent is given by:
(a) IRt (b) I²Rt (c) `IR^2t` (d) `I^2R ⁄t`
Concept: undefined >> undefined
A current of 2 A is passed through a coil of resistance 75Ω for 2 minutes. (a) How much heat energy is produced? (b) How much charge is passed through the resistance?
Concept: undefined >> undefined
Calculate the current through a 60 W lamp rated for 250 V. If the line voltage falls to 200 V, how is the power consumed by the bulb affected?
Concept: undefined >> undefined
An electric bulb is rated ‘100 W, 250 V’. How much current will the bulb draw if connected to a 250 V supply?
Concept: undefined >> undefined
An electric bulb is rated at 220 V, 100 W. (a) what is its resistance? (b) what safe current can be passed through it?
Concept: undefined >> undefined
A bulb of 40 W is used for 12.5 h each day for 30 days. Calculate the electrical energy consumed.
Concept: undefined >> undefined
An electric iron is rated at 750 W, 230 V. Calculate the electrical energy consumed by the iron in 16 hours .
Concept: undefined >> undefined
An electrical appliance having a resistance of 200Ω is operated at 200 V. Calculate the energy consumed by the appliance in 5 minutes (i) in joules (ii) in kWh.
Concept: undefined >> undefined
A bulb marked 12 V, 24 W operated on a 12 volt battery for 20 minutes. Calculate:
(i) the current flowing through it, and
(ii) the energy consumed
Concept: undefined >> undefined
