Understanding Linear Graphs and Internal Resistance

What is the purpose of using a watt meter and an ammeter in the experimental setup?

• To measure the voltage and current in the circuit

• To measure the temperature of the circuit

• To measure the resistance of the circuit

• To measure the power consumption of the circuit

How many sets of readings are collected before plotting the graph?

• 5 sets

• 8 sets

• 12 sets

• 10 sets

In the equation V = -IR + E, what does the 'E' represent?

• The internal resistance

• The electromotive force (EMF)

• The current

• The potential difference

What is the vertical axis in the graph of V = -IR + E?

• Potential difference (V)

• Resistance (R)

• Electromotive force (E)

• Current (I)

What does the gradient of the graph represent?

• The positive internal resistance

• The negative internal resistance

• The electromotive force

• The potential difference

Why might students mistakenly think the graph is incorrect?

• Because the graph is a straight line

• Because the graph has a positive gradient

• Because the graph slopes downwards

• Because the graph is not plotted

What should students remember about the graph's appearance?

• It should be a horizontal line

• It should be a curve

• It can slope downwards due to different setups

• It should always slope upwards

How is the internal resistance determined from the graph?

• By the y-intercept

• By the positive gradient

• By the negative gradient

• By the slope of the curve

What is the significance of the y-intercept in the graph?

• It represents the electromotive force (EMF)

• It represents the current

• It represents the potential difference

• It represents the internal resistance

What happens to the internal resistance value when the gradient is negative?

• It remains negative

• It becomes undefined

• It becomes positive

• It becomes zero