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Physics: Urgent help to do with electricity needed?
I have an exam tomorrow about electricity and the investigation question is
"You are going to carry out an experiment to investigate how current I through a power supply varies with resistor R connected across it"
Is the resistor going to be a variable resistor? And what would the graph look like?
Does this relate to the emf of the power supply in any way?
1 Answer
- trueproberLv 76 years agoFavorite Answer
Hi Candee_Puffs, yes it has to be a variable resistor. Considering the cell is having least internal resistance, the emf would remain the same. As resistance increases then current decreases. So the graph is a st line with a negative slope.