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Worksheet
1. A 1.40 ohm resistor is connected across a 9.00-V battery. The voltage between the terminals of the
battery is observed to be only 8.00 V. Find the internal resistance of the battery.
2. a) A battery has an emf
and an internal resistance r. When the battery is connected to a 28.0 W
resistor, the current through the battery is 0.604 A. When the battery is connected to a 53.1 W resistor,
the current is 0.499 A. Calculate the emf of the battery in volts, V.
b)Calculate its internal resistance in ohms, .
3. For the circuit in the figure below, calculate the following.
= 5.7 V
R = 6.2Ω
r = 0.9Ω
a) the magnitude of the current and the direction of positive current
b) the potential difference across the battery terminals a and b
c) the rate at which heat is being produced in the 6.2 Ω resistor
d) the rate at which heat is being produced inside the battery
e) the rate at which the battery's chemical energy is being used