Current - part3

Question 1

Work formula in a battery -

Answer 1

W=VIt , W=V^2t/R , W=I^2Rt

Question 2

What is electrical power ?

Answer 2

Rate at which electrical energy is supplied .

Question 3

Electrical power formula =

Answer 3

P=W/t , P= I^2R,P=V^2/R

Question 4

1KW=
1MW=
1GW=

Answer 4

10^3
10^6
10^9

Question 5

What is watt hour ? kilowatt hour ?

Answer 5

Watt hour - electrical energy consumed by a electrical appliance of power 1 watt for 1 hour
Kilowatt hour - electrical energy consumed by a electrical appliance of power 1 kilo watt for 1 hour

Question 6

1Wh -

1Kwh-

Answer 6

3600J

3.6*10^6J

Question 7

resistance of an appliance by -power rating and voltage rating
ALSO CURRENT THROUGH ELEMENT WHEN IT IS IN USE BY “ “

Answer 7

R=V^2/P

I = P/V

Question 8

Why the actual resistance of the filament in bulb is much lesser than when it is glowing ?

Answer 8

resistance increases by increase in temp

Question 9

why bulb fuses?

Answer 9

If the current exceeds the safe limit the temp of filament increases and the filament melts and fuses .

Question 10

energy KWH -[formula]

Answer 10

KWH - KW * T [IN HR]

KWH = VIT/1000

Question 11

heat =

Answer 11

I^2 Rt

Question 12

H = [relationship with cal]

Answer 12

0.24I^2Rt CAL

Question 13

HEAT DEPENDS ON 3 FACTORS

Answer 13

H IS DIRECTLY PROPOTIONAL TO R
H IS DIRECTLY PROPOTIONAL TO t
H IS DIRECTLY PROPOTIONAL TO i^2