How to convert volts to amps

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.

Volts to amps calculation with watts

So 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

Example 1

What is the current flow of an electrical circuit that has power consumption of 45 watts and voltage supply of 10 volts?

I = 45W / 10V = 4.5A

Example 2

What is the current flow of an electrical circuit that has power consumption of 45 watts and voltage supply of 20 volts?

I = 45W / 20V = 2.25A

Example 3

What is the current flow of an electrical circuit that has power consumption of 25 watts and voltage supply of 10 volts?

I = 25W / 10V = 2.5A

Example 4

What is the current flow of an electrical circuit that has power consumption of 25 watts and voltage supply of 20 volts?

I = 25W / 20V = 1.25A

Volts to amps calculation with ohms

So 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

Example 1

What is the current flow of an electrical circuit that has voltage supply of 50 volts and resistance of 20Ω?

According to ohm's law the current I is equal to 50 volts divided by 20 ohms:

I = 50V / 20Ω = 2.5A

Example 2

What is the current flow of an electrical circuit that has voltage supply of 60 volts and resistance of 20Ω?

According to ohm's law the current I is equal to 60 volts divided by 20 ohms:

I = 60V / 20Ω = 3A

Example 3

What is the current flow of an electrical circuit that has voltage supply of 90 volts and resistance of 20Ω?

According to ohm's law the current I is equal to 90 volts divided by 20 ohms:

I = 90V / 20Ω = 4.5A

Example 4

What is the current flow of an electrical circuit that has voltage supply of 100 volts and resistance of 20Ω?

According to ohm's law the current I is equal to 100 volts divided by 20 ohms:

I = 100V / 20Ω = 5A

 

Amps to volts calculation ►

 

See also

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