26. If| = 0.40 A in the circuit segment shown below, what is the potential diffe

Question

26. If| = 0.40 A in the circuit segment shown below, what is the potential difference V-K? a 10? A) 12 V B) 16 V 8.0 ? 120 D) 22 V E) 25 V o.u- Vind 10 ? 27 To electroplate a metal shield with gold, the shield is placed in a solution containing gold ions (Au), and an electric current is run through the solution from external wires (with one wire affixed to the shield). For each electron that passes through the system, a single gold atom is deposited on the surface of the shield. How much gold will be deposited if a 14.0-A current runs through the system for 19 minutes? [A gold ion, Au', has a mass of approximately 3.3 x 10-22 g] A) 16 g 22g C) 28 g D) 33 g E) 97 g mo 3.3xlog Io 28. A 1500-W heater is connected to a 120-V line. If the heater coverts electric energy entirely to heat energy, about how much heat energy does it produce in 2.0 hours of operation? A) 1.5 kJ B) 3.0 kJ C) 180 kJ ?11,000 kJ E) 18,000 kJ IrAin 1500 oroo

Explanation / Answer

Problem 26)

I2 (current in 8 ohm) = 0.4*12/8 = 0.6 ampere

therefore current through 10 ohms is I3 = 0.6 + 0.4 = 1 A

Va - Vb = 10*1 + 0.4*12 + 10*1 = 24.8 volts ~ 25 volts

(E) IS CORRECT

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