Understanding Voltage, Current, and Resistance

This video tutorial covers the fundamental concepts of voltage, current, and resistance. It begins by explaining voltage as the electric potential energy difference per unit charge, measured in volts. The tutorial then describes current as the flow of electrons, measured in amps, and uses a water analogy to illustrate its behavior. Resistance is introduced as a property that opposes current flow, measured in ohms, with examples of how wire length and thickness affect resistance. The video concludes with Ohm's Law, which relates voltage, current, and resistance, and provides practical examples to demonstrate its application.

What is the unit of voltage?

• Coulomb

• Volt

• Ohm

• Ampere

How is current defined in terms of electron flow?

• The speed of electrons

• The rate of electron flow

• The energy of electrons

• The direction of electron flow

Which wire will have more resistance?

• A long, thin wire

• A short, thin wire

• A long, thick wire

• A short, thick wire

What happens to current if resistance increases?

• Current fluctuates

• Current decreases

• Current remains the same

• Current increases

According to Ohm's Law, what happens to current if voltage is increased while resistance is constant?

• Current decreases

• Current increases

• Current remains the same

• Current becomes zero

In which direction does conventional current flow?

• From low to high potential

• From high to low potential

• Opposite to the direction of electron flow

• In the direction of electron flow

What is the voltage across a resistor if the electric potential difference is 8 volts?

• 4 volts

• 8 volts

• 12 volts

• 16 volts

If a 12 volt battery is connected to a 4 ohm resistor, what is the current flowing through the circuit?

• 2 amps

• 3 amps

• 4 amps

• 5 amps

How do you convert 120 milliamps to amps?

• Subtract 1000

• Multiply by 1000

• Divide by 1000

• Add 1000

What is the internal resistance of a hairdryer that pulls 0.8 amps from a 120 volt source?

• 180 ohms

• 150 ohms

• 120 ohms

• 100 ohms