I am currently doing a lab trying to calculate internal resitance of a battery. Do I use the formula V=IR?
What do you mean? . Surely you know that if you increase resistance, current will decrease and voltage will increase?JoakimvE said:you mean to say, that an ammeter or voltmeter would come to effect my results?
This depends on the meters you are using. If you are using a modern digital meter, then then I doubt that you will be able to detect their presence. If you are using an old fashioned analog meter with a D'Arsonal/needle movement, then yes, they will have a measurable effect.JoakimvE said:you mean to say, that an ammeter or voltmeter would come to effect my results?
You actually don't need to.. First, short circuit the battery to find its emf. Set up your circuit with the variable resistor, voltmeter and ammeter connected properly. Now increase the resistance by moving the slide and record 5 reading for voltage and current (from the voltmeter and ammeter)JoakimvE said:anyhow, i guess the main problem is how much i varied the resistance by. i just varied the electric field (E)... im guessing i cant calculate the resistance i added.