A battery has an emf E and an internal resistance r . When the battery is connec

Question

A battery has an emf E and an internal resistance r. When the battery is connected to a 25?? resistor, the current through the battery is 0.65A . When the battery is connected to 55?? resistor, the current is 0.50A .

Part A Find the battery's emf. Express your answer using two significant figures. E =
V
Part B Find the battery's internal resistance. A battery has an emf E and an internal resistance r. When the battery is connected to a 25?? resistor, the current through the battery is 0.65A . When the battery is connected to 55?? resistor, the current is 0.50A .

A battery has an emf E and an internal resistance r. When the battery is connected to a 25?? resistor, the current through the battery is 0.65A . When the battery is connected to 55?? resistor, the current is 0.50A .

A battery has an emf E and an internal resistance r. When the battery is connected to a 25?? resistor, the current through the battery is 0.65A . When the battery is connected to 55?? resistor, the current is 0.50A .

Part A Find the battery's emf. Express your answer using two significant figures. E =
V
Part A Find the battery's emf. Express your answer using two significant figures. E =
V
E =
V E =
V
Part B Find the battery's internal resistance. E =
V

Explanation / Answer

let emf of battrey be E and resistance be r

i = E/(R+r)

0.65 = E/ 25+r

0.5 = E/ 55+r

r = 22.5/.3 = 75 ohms

hence E = 65 volts

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