Investigation of the emf and internal resistance of electric cells and batteries by measuring the variation of the terminal pd of the cell with current in it Flashcards
1
Q
How is emf calculated from a graph
A
terminal pd against I
Y-intercept is emf
2
Q
How is current varied
A
variable resistor
3
Q
where is the voltmeter placed
A
parallel with resistor
4
Q
precaution
A
- care to prevent short circuits
- wire heats up, turn off between use
