MohdShihaab
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how power can be calculated from current and voltage
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uberteknik
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(Original post by MohdShihaab)
how power can be calculated from current and voltage
For direct current:

P = I x V
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MohdShihaab
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(Original post by uberteknik)
For direct current:

P = I x V
nah i know that... i want the answer in full detailed form as it is part of my assessment? everything should be in physics theory pleaseeee?? ASAP
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RogerOxon
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(Original post by MohdShihaab)
how power can be calculated from current and voltage
Current is Coulombs per second. Voltage is Joules per Coulomb, so P=VI.
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artful_lounger
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Well write down what current and voltage are and use your reasoning and physical intuition to deduce what the nature of power is.

You'll need to think about charges/electrons moving.
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Dowel
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Current is the rate of flow of charge I=Q/t. We get this from simple logic, we know that particles can be charged and can experience an emf that moves them around a circuit. If the emf is larger then the charged particles will move faster (towards the point with a p.d with a value further from their charge (( electrons will move to the more positive point.)).
Voltage is the potential difference between two points and = the work done per unit charge between the two points.
Power is just the amount of work done per unit time. So P = Wd/t and V = Wd/Q
So Wd = VQ and Wd = Pt
so VQ = Pt
VQ/t = P
but Q/t = I
so VI = P
P = IV

Hope this helped, It's not super in depth but it depends if you need to know more about quantities such as the Work Done
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