A 12V battery is connected to a capacitor, resulting in 54.0  C of charge stored on the capacitor.  How much energy is stored in the capacitor?

The potential difference across the terminals of a battery is 8.1 V when there is a current of 1.51 A in the battery from the negative to the positive terminal. When the current is 3.44 A in the reverse direction, the potential difference becomes 9.7 V . What is the internal resistance of the battery and What is the emf of the battery?

Figure P18.19 shows a circuit diagram. (R1 = 1550 , R2 = 430 , ΔV = 20.5 V) (a) Determine the current. (b) Determine the potential of wire A relative to ground. (c) Determine the voltage drop across the 1550  resistor.

A solar cell generates an EMF of 12 V. The terminal potential difference of 9.6 V is measured when a 6 º resistor is connected across the battery. What is the internal resistance of the solar cell? The internal resistance, r = Units Select an answer How much power is released in the cell and in the load? The power in the cell, Pinternal = = Units Select an answer ✓ The power in the load, Puseful = What maximum useful power can be generated by the cell? The max. power, Pmax Units Select an answer Units Select an answer ✓

The circuit below contains two real batteries, each having significant internal resistance. Battery #1 has an EMF of 6.00 V and an internal resistance of 1.00 ohm. Battery #2 has an EMF of 12.00 V and an internal resistance of 2.00 ohms. These two batteries are connected in series with two resistors R, = 6.00 ohms and R,= 3.00 ohms. ri d (6.00,V) (1.00 0) R1 (6.00 N) R2 (3.00 N) a r2 E2 (2.00 Q) (12.00 V) 18. The current in the 12.00 Volt battery is equal to C. 0.500 A. A. 0.750 A. B. 1.00 A. D. 2.00 A. E. 1.50 A. 19. The potential difference across the terminals of battery #1 from point C to point d is equal to C. 7.00 V. A. 5.50 V. B. 6.00 V. D. 5.00 V. E. 6.50 V. 20. The potential difference across the terminals of battery #2 from point a to point b is equal to C. 13.00 V. A. 14.00 V. В. 10.00 V. D. 11.0 V. E. 12.00 V.

An auto mechanic needs to determine the emf and internal resistance of an old battery. He performs two measurements: in the first, he applies a voltmeter to the battery's terminals and reads 11.8 V; in the second, he applies an ammeter to the terminals and reads 15.3 A. What are the battery's emf E and internal resistance r? E = V r = II