physics gcse question

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jennaa21
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#1
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#1
this is the question:
The output of a mobile phone charger is labelled ‘5 V, 1 A, 5 W’. How much electrical energy will be supplied by the charger when it runs steadily for ten minutes?

i dont really understand
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SpeedBird1004
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#2
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Whats power?
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jennaa21
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#3
(Original post by SpeedBird1004)
Whats power?
huh?
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SpeedBird1004
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(Original post by jennaa21)
huh?
Define power?
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jennaa21
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#5
(Original post by SpeedBird1004)
Define power?
rate of energy being transferred
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SpeedBird1004
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Okay. Can you define it using the formula. What you said is right. But in terms of a formula for Power, P = ?

(Original post by jennaa21)
rate of energy being transferred
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jennaa21
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(Original post by SpeedBird1004)
Okay. Can you define it using the formula. What you said is right. But in terms of a formula for Power, P = ?
energy transferred/time
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SpeedBird1004
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(Original post by jennaa21)
energy transferred/time
Okay good.
Power = Energy transferred/ time

whats the power provided in the question?
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jennaa21
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(Original post by SpeedBird1004)
Okay good.
Power = Energy transferred/ time

whats the power provided in the question?
5?
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Ethanity007
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#10
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Energy = power x time.

Make sure power is in watts and time in seconds for you to calculate the energy in Joules
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SpeedBird1004
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(Original post by jennaa21)
5?
Yes power is measured in Watts.
So 5 Watts = 5 Joules per second
whats the time duration in seconds?
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jennaa21
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#12
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(Original post by Ethanity007)
Energy = power x time.

Make sure power is in watts and time in seconds for you to calculate the energy in Joules
ok so i got the answer 600 seconds x 5W = 3000J is that correct?
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SpeedBird1004
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(Original post by jennaa21)
ok so i got the answer 600 seconds x 5W = 3000J is that correct?
Yea thats right!
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jennaa21
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#14
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(Original post by SpeedBird1004)
Yes power is measured in Watts.
So 5 Watts = 5 Joules per second
whats the time duration in seconds?
ohhh so its 600 x 5 = 3000J
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SpeedBird1004
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(Original post by jennaa21)
ohhh so its 600 x 5 = 3000J
Yep. You just have to make sure time is in seconds because the definition of 1 watt = 1 Joule per second
so if you want to multiply power by time, time must be in seconds!

thats it.
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jennaa21
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#16
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(Original post by SpeedBird1004)
Yea thats right!
thank u sm!!!
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SpeedBird1004
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#17
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#17
(Original post by jennaa21)
thank u sm!!!
np
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