(a) Write two points of difference between electric energy and electric power. (6) Out of 60 W and 40 W lamps, which one has higher electrical resistance when in use.
(c) What is the commercial unit of electric energy? Convert it into joules.
Answers
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(a)1.Electrical power is the rate of amount of electrical energy transferred. electrical energy is the energy generated as the result of the potential difference in a circuit which causes current to flow through it. 2.Energy is measured in joules. Electrical energy is usually measured in KWH(kilo-watt-hours). Electrical power is measured in Watts or KW. (b)=P/V I1=60/V I2=40/V I1/I2=60/V/40/V =60/40 => I1>I2 Since, R is indirectly proportional to I I2 has high resistance So, 40W lamp has greater resistance. (c)Kilowatt per hour is the commercial unit of electric energy.1 Watt is 1 Joule per second. 1 kilowatt=1000 joules per second. Apply it for one hour (3600 seconds) and you have a kilowatt-hour, good for 3600 * 1000 joules=3600000joules.
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(a)1.Electrical power is the rate of amount of electrical energy transferred. electrical energy is the energy generated as the result of the potential difference in a circuit which causes current to flow through it. 2.Energy is measured in joules. Electrical energy is usually measured in KWH(kilo-watt-hours). Electrical power is measured in Watts or KW. (b)=P/V I1=60/V I2=40/V I1/I2=60/V/40/V =60/40 => I1>I2 Since, R is indirectly proportional to I I2 has high resistance So, 40W lamp has greater resistance. (c)Kilowatt per hour is the commercial unit of electric energy.1 Watt is 1 Joule per second. 1 kilowatt=1000 joules per second. Apply it for one hour (3600 seconds) and you have a kilowatt-hour, good for 3600 * 1000 joules=3600000joules.l hope it will help you dear..plz mark as brainliest answer ☑️✔️
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