At the end of this module, you will be able to calculate the relationship between resistance, voltage and current using Ohm's Law.

Textbook: DC/AC Principles: Analysis and Troubleshooting - Chapter 3 Ohm's Law

Ohm's Law provides a simple mathematical relationship between Resistance, Current and Voltage.

The relationship is expressed as:

## V = I x R

Where:

- V = Voltage in units of Volts (Symbol V)
- I = Current in units of Amperes ( Symbol A)
- R = Resistance in units of Ohms (Greek Symbol Omega)

A Series Circuit has a current I = 10 mA flowing through a resistor R1 = 5 Kohm. What is the voltage of the Voltage Source Vs ?

Using Ohm's Law:

## V = I x R

We can substitute the values for the current I and the resistance R1 in the above equation.

## V = 10 mA x 5 Kohms = 50 Volts

Ohm's Law provides a simple mathematical relationship between Voltage, Current and Resistance in an electric circuit.

2. Ohm's Law states that:

- a. current is inversely proportional to the voltage and directly proportional to the resistance.
- b. current is directly proportional to the voltage and inversely proportional to the resistance.
- c.current is directly proportional to the voltage and directly proportional to the resistance.
- d.current is inversely proportional to the voltage and inversely proportional to the resistance.

3. What would be the effect on the current flowing through a resistor if the resistance increased while the voltage remained constant?

- a. current would increase.
- b. current would increase exponentially.
- c. current would decrease.
- d. current would remain constant.

4. If the applied voltage Vs is 85 Volts and R1 = 9 Kohm, solve for the circuit current:

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