Electrical Formula

Ohm's law

Ohm's law is a basic law of electrical circuits. It states that the potential difference V which is applied at the ends of a conductor of resistance R is proportional to the current intensity I circulating through the conductor.

Potential difference = Resistance of the conductor cable * Current intensity

The equation is written

V = R*I

We have:

V = Potential difference

R = Resistance of the conductor cable

I = Current intensity

Ohm's law Questions:

1) Determine the potential difference of a 10Ω resistance cable if a current intensity of 20mA passes through the cable.

Answer: First calculate the potential difference using the formula above, where R = 10Ω and I = 20mA

V = R*I

V = 10Ω*20*10^-3A

V = 0.2v.

2) How much current will pass through a 15Ω resistor wire if it is connected to a 60 volt battery?

Answer: First calculate the current by clearing I of the formula above, where R = 15Ω and V = 60v.

V = R*I

I = V/R

I = 60v/15 Ω

I = 4A.