Physical Properties of the Electric Current: Ohm's Law

The video tutorial explains Ohm's Law, which relates voltage, current, and resistance in an electrical circuit. It provides the fundamental equations: I = V/R, V = IR, and R = V/I. An example problem is solved, demonstrating how to calculate the current flowing through a light bulb powered by a 4-volt battery with a resistance of 60 ohms, resulting in a current of 0.066 amps.

What does Ohm's Law help you determine if two of the three variables are known?

• The power of the circuit

• The resistance of the circuit

• The missing variable among voltage, current, and resistance

• The efficiency of the circuit

Which formula represents the relationship between current, voltage, and resistance?

• I = V * R

• I = V / R

• V = I * R

• R = I / V

If you know the voltage and current in a circuit, how can you find the resistance?

• R = V * I

• R = V / I

• R = I * V

• R = I / V

In the flashlight example, what is the resistance of the light bulb?

• 0.066 ohms

• 240 ohms

• 60 ohms

• 4 ohms

How much current flows through the light bulb in the flashlight example?

• 0.066 amps

• 4 amps

• 0.4 amps

• 60 amps