Ohms law - Math

Question

Ohm's Law: Equation

V = IR

Where:

 

1. V = electrical potential difference (unit is volts, and often referred to as voltage, and the symbol is "V")
2. I = electrical current (unit is amperes, often referred to as amperage, or amps, and the symbol is "A")
3. R = electrical resistance (unit is the ohm, and the symbol is "Ω", which is the Greek letter "Omega")

 

Use Ohm's Law and what you know about equations to solve the following:

a. A circuit has a total resistance of 105Ω and a current of 10A. What is the electric potential difference between two points on that circuit?

 

b.A circuit has a potential difference of 19V and a total resistance of 10Ω. What is the current in that circuit?

Answer 1

a. It tells you what V, I and R stand for. So, all you have to do is plug in 105 for R and 10 for I in the equation V = IR:

V = (10)(105)

V is your answer (1050)

b. plug in 19 for V and 10 for R:

19 = 10 x I

Then, rearrange the equation solving for I by dividing both sides of the equation by 10

19/10 = 10I/10

I = 19/10

I is your answer (1.9)