Which of the following are self-contradictory combinations of circuit elements? a. A 12-V voltage source in parallel with a 2-A current source. b. A 2-A current source in series with a 3-A current source. c. A 2-A current source in parallel with a short circuit. d. A 2-A current source in series with an open circuit. e. A 5-V voltage source in parallel with a short circuit.

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Choose the correct answer and show complete and detailed solution: A. A 10-ohm resistor is connected in series witg another resistor of an unknown resistance to a 120V source. The voltage measured across the 10-ohm resistors is 48V. Find the unknown resistor: A. 25-ohms B. 20-ohms C. 15-ohms D. 10-ohms B. An emf of 12V is applied across a series combination of a 15-ohms and a 3-ohms resistor. The current in the 3-ohms is? A. 8.4A B. 0.67A C. 0.75A D. 4.8A C. The potential difference accross the 15-ohms resistor in Problem B is? A. 10V B. 6V C. 2.4V D. 2V

In an electrical circuit four resistors are connected in parallel and their equivalent resistance is 50ohms. Find the value of each resistors if the currents through each impedance are 0.8, 0.4, 0.6 and 0.2 ampere.

In a house, a circuit often includes multiple electrical outlets which are parallel-connected to a single voltage source. Each of these circuits also contains a 15-A circuit breaker. Design a parallel-connected circuit which shows three electrical outlets con-nected to a voltage source with a circuit breaker. What is the advantage of having out-lets parallel-connected, and why is a circuit breaker connected in series with the voltage source? Why is the circuit breaker considered a necessary safety item in the circuit?

4. The heating element in an oven has a resistance of R =32 ohms. One of thewires connecting the oven to the 220 volt power source is loose, contributingan additional r = 5 ohms to the closed-loop circuit. What is the power Povenradiated in the oven, and what is the rate Pcontact at which heat is dissipatedat the loose contact? The looser is the connection, the greater is the resistance r: What value of r is most likely to cause a fire. Also agraph showing Pcontact versus r

A component requires 6.3-V across it with a current of 0.3 V. A second component requires 12.6-V at 0.15A.  The two components are connected in series. What is the value of resistor that must be connected across the 12.6-V component to allow it to operate properly when in series with the 6.3-V component?