Kirchoff's rules state "The algebraic sum of changes in potential:   a. around any closed loop must be zero."   b. entering a junction must equal the sum of all potentials leaving a junction."   c. in a circuit is equal to the algebraic sum of all currents multiplied by the sum of all of the resistances.   d. both a and b.   e. all of these.

4. In an ECG, if the potential between the Right and left arm leads is 0.8 mV, and the potential between left leg/left foot and left arm leads is 1.2 mV, what is the potential between right arm and left leg/left foot in mV?

2. An RC circuit with a 1-0 resistor and a 0.000001-F capacitor is driven by a voltage E (t) = sin 100 t V. If the initial capacitor voltage is zero, determine the subsequent resistor and capacitor voltages and the current.

What is not a resistor? Check all that apply. a. Something that limits the flow of electrons b. Something that limits the voltage c. Something that robs energy from the system in terms of heat d. Something that produces a voltage drop across it

1.a. An unintentional electrical path that's conducting current from an ungrounded conductor to a normallynoncurrent-carrying metal raceway would be defined as a groundA. conductor.B. fault.C. electrode.D. interrupter. 1.b. It's important for designers and installers to ensure that equipment ground-fault current paths have________, which will facilitate the tripping of the overcurrent protective device.A. low impedanceB. proper labelingC. high impedanceD. an equilibrium

14. A power supply providing 85 V is hooked in series to a lightbulb, using two connecting wires. The lightbulb has a resistance bulb B. of 130 N and the wires have a resistance of 15 2 each. The actual question is, how much power does the bulb use, and how much power is lost in the wires? This is broken down into steps. a. What is the equivalent resistance of the series circuit? [160 Q] b. What is the current through the circuit? [.53 A] c. What is the magnitude of the potential difference between points A and B? (What is the voltage across wire 1?) [8 V] d. What is the magnitude of the potential difference between points wire 1 wire 2 A B and C? (What is the voltage across the bulb?) [69 V – note that the voltage across the bulb is NOT the 85 V of the power supply. The sum of the voltages, 8+69+8, around the circuit, IS the voltage of the power supply.) e. How much power is used by the bulb? [36.6 W] f. How much power is lost in the one of the wires? [4.2 W] |