Circuit Analysis and Resistor Effects

The video tutorial covers a circuit problem from a November 2017 exam paper, focusing on current electricity. It explains the setup of a circuit with three resistors and a battery, and guides through calculating the current, EMF, and resistance. The tutorial also explores the effects of removing a resistor on the circuit's total resistance and current.

What is the total resistance between points A and B in the circuit?

• 6 ohms

• 3 ohms

• 12 ohms

• 9 ohms

What is the resistance of resistor T?

• 0.9 ohms

• 1.5 ohms

• 6 ohms

• 3 ohms

What is the potential difference across points A and B when the switch is closed?

• 3 volts

• 4 volts

• 5 volts

• 6 volts

How is the current in the circuit calculated between points A and B?

• I = R / V

• I = V / R

• I = V * R

• I = V + R

What is the calculated current delivered by the battery?

• 0.5 A

• 0.7 A

• 0.83 A

• 1 A

Which of the following is a method to calculate the EMF of the battery?

• Using only internal resistance

• Using only the current

• Using both internal and external resistances

• Using only external resistance

What is the voltage across resistor M if the voltage across resistor N is 2.5 volts?

• 3 volts

• 2.5 volts

• 5 volts

• 1.5 volts

What happens to the total resistance if resistor T is removed from the circuit?

• It doubles

• It remains the same

• It decreases

• It increases

How does the removal of resistor T affect the total current in the circuit?

• It remains the same

• It becomes zero

• It increases

• It decreases

What happens to the lost volts if the current in the circuit increases?

• They decrease

• They increase

• They remain the same

• They become zero