Understanding Potential Difference and EMF

The video tutorial explains the concept of modeling a real cell as an ideal cell with an EMF and internal resistance. It introduces components like resistors and bulbs, and defines key terms such as electromotive force (EMF), terminal potential difference, and potential difference. The tutorial uses examples to illustrate these concepts, explaining how EMF is the energy transferred to electrical energy per unit charge, while terminal potential difference is the energy transferred to external components. Potential difference is the work done per unit charge across a single component. The video concludes by summarizing these concepts and their applications in circuits.

What is the purpose of modeling a real cell as an ideal cell with EMF and internal resistance?

• To reduce the cost of the cell

• To simplify calculations by ignoring internal resistance

• To better understand the behavior of real cells

• To increase the efficiency of the cell

How is electromotive force (EMF) defined?

• The energy transferred to electrical energy per unit charge

• The force exerted by a cell on a charge

• The voltage across a single component

• The resistance of a cell

Which of the following best describes terminal potential difference?

• The voltage across the internal resistance

• The energy lost as heat in the cell

• The electrical energy transferred to other forms per unit charge in external components

• The total voltage a cell can provide

What is the potential difference across a single component?

• The total voltage a cell can provide

• The voltage across all external components

• The work done per unit charge to move a charge across the component

• The energy lost as heat in the internal resistance

How is the EMF of a cell related to the work done in a circuit?

• It is the work done to overcome the internal resistance

• It is the work done per unit charge to move a charge around the circuit

• It is the work done to move a charge across a single component

• It is the work done to dissipate energy as heat

What happens to the energy not transferred to external components in a circuit?

• It is converted back to chemical energy

• It is lost to the environment

• It is dissipated as heat in the internal resistance

• It is stored in the cell

If a cell has an EMF of 6 volts and the terminal potential difference is 5 volts, what is the voltage lost in the internal resistance?

• 4 volts

• 1 volt

• 2 volts

• 3 volts

What is the potential difference across a resistor if the total potential difference across two components is 5 volts and the other component has 2 volts?

• 1 volt

• 4 volts

• 2 volts

• 3 volts

How much energy is dissipated in the external components if 5 joules is dissipated per coulomb of charge?

• 3 joules

• 5 joules

• 7 joules

• 1 joule

What is the role of internal resistance in a cell?

• To dissipate energy as heat

• To store energy

• To increase the EMF

• To reduce the voltage across external components