How to convert electrical voltage in volts (V) to electric current in amps (A).

You can calculate amps from volts and watts or ohms, but you can't convert volts to amps since volt and amp units represent different quantities.

The current *I* in amps (A) is equal to the power *P* in watts (W) , divided
by the voltage *V* in volts (V):

*I*_{(A)} = *P*_{(W)}* */* V*_{(V)}

So

amp = watt / volt

or

A = W / V

What is the current flow of an electrical circuit that has power consumption of 45 watts and voltage supply of 15 volts?

*I* = 45W / 15V = 3A

The current *I* in amps (A) is equal to the voltage *V* in volts (V)
divided by the resistance *R* in ohms (Ω):

*I*_{(A)} = * V*_{(V)} /
*R*_{(Ω)}

So

amp = volt / ohm

or

A = V / Ω

What is the current flow of an electrical circuit that has voltage supply of 30 volts and resistance of 10Ω?

According to ohm's law the current I is equal to 30 volts divided by 10 ohms:

*I* = 30V / 10Ω = 3A

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