the terminal p.d of a battery is 12volts when an external circuit of 20 ohms was connected and 13.5volts when an external resistanceof 45 ohms was connected. calculate the e.m.f and the internal resistance of the battery
We will note the e.m.f. of a battery by , it's internal resistance by , the external resistance by and the terminal p.d. by . Then we have
So we have a system of two linear equations :
By solving this system we get that .
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