[填空题] NOTE: This is a data-based question that would normally appear on Paper 3, Section A
The circuit shown is used to measure the internal resistance of a cell. The voltmeter and the ammeter used are ideal.
1.(1)Differentiate between precise and accurate measurements.
(2)The voltmeter used has a zero error. State the type of uncertainty this will introduce into the voltmeter's measurements.
2.(1)The graph shows the variation of the voltmeter's reading with current.ε= V
Determine the emf of the cell.
(2)Estimate the internal resistance of the cell including its uncertainty.
(3)Determine whether the zero error in the voltmeter will affect the calculated value of the internal resistance. Justify your answer.
