Understanding Electric Potential Difference

This video tutorial explains the concept of electric potential difference, often referred to as voltage, using examples with resistors. It demonstrates how to calculate the potential difference and current using Ohm's Law. The video also discusses the direction of current flow, comparing it to water flow, and provides an example with negative potentials. The tutorial concludes with a summary and a call to action for viewers to subscribe.

What is the electric potential difference between two points if the potential at point A is 50 volts and at point B is 20 volts?

• 50 volts

• 70 volts

• 30 volts

• 20 volts

According to Ohm's Law, what is the formula to calculate current?

• R = V/I

• V = IR

• I = V/R

• I = VR

In which direction does conventional current flow?

• It does not flow

• In any direction

• From high to low potential

• From low to high potential

What analogy is used to explain the direction of electric current?

• Wind flow

• Sound flow

• Water flow

• Light flow

If the electric potential at point A is -30 volts and at point B is -12 volts, which point has a higher potential?

• Cannot be determined

• Both are equal

• Point B

• Point A

What is the electric potential difference between points A and B if VA = -30 volts and VB = -12 volts?

• 18 volts

• 42 volts

• 12 volts

• 30 volts

Using Ohm's Law, what is the current through a resistor with 18 volts across it and a resistance of 3 ohms?

• 12 amps

• 9 amps

• 6 amps

• 3 amps

What is the resistance value used in the second example?

• 1 ohm

• 10 ohms

• 3 ohms

• 5 ohms

What is the significance of knowing the direction of current flow in a circuit?

• To measure power

• To understand circuit behavior

• To calculate resistance

• To determine voltage

What is the final current calculated in the second example?

• 6 amps

• 3 amps

• 9 amps

• 12 amps