Understanding Batteries and Circuits

What is the main difference between primary and secondary cells?

• Primary cells can be recharged, secondary cells cannot.

• Primary cells are used in cars, secondary cells are not.

• Primary cells are one-time use, secondary cells can be recharged.

• Primary cells are more expensive than secondary cells.

Which of the following is a common example of a secondary cell?

• AA battery in a remote control

• Button cell in a wristwatch

• Lithium battery in a smartphone

• Disposable camera battery

What does the term 'electromotive force' (EMF) refer to?

• The resistance within a battery

• The voltage drop across a resistor

• The energy transferred per unit charge

• The force that moves electrons through a circuit

How is internal resistance represented in a circuit diagram?

• As a voltage source

• As a large R

• As a Greek letter epsilon

• As a small r

In a series circuit, how do you calculate the total resistance?

• By adding the resistances of all components

• By subtracting the smallest resistance from the largest

• By multiplying the resistances of all components

• By dividing the total voltage by the total current

What is the relationship between EMF and terminal voltage in a battery?

• EMF is always greater than terminal voltage due to internal resistance.

• EMF is always less than terminal voltage.

• EMF and terminal voltage are always equal.

• EMF is unrelated to terminal voltage.

How can you experimentally determine the internal resistance of a battery?

• By calculating the power output of the battery

• By using a multimeter to measure resistance directly

• By graphing current versus voltage and analyzing the slope

• By measuring the voltage drop across the battery

What does the slope of a current versus voltage graph represent in a battery circuit?

• The internal resistance

• The external resistance

• The power output

• The total voltage

What is the y-intercept of a current versus voltage graph in a battery circuit?

• The EMF of the battery

• The external resistance

• The total current

• The internal resistance

Which equation is used to calculate the terminal voltage of a battery?

• V = I * R

• V = EMF - I * r

• V = EMF + I * r

• V = I / R