1. "The sum of the emf's and potential differences around a closed loop equals zero" is a consequence of:
A.Newton's third law
B.Ohm's law
C.Newton's second law
D.conservation of energy
E.conservation of charge


2.

A portion of a circuit is shown, with the values of the currents given for some branches. What is the direction and value of the current i?




A.¯, 6A
B.­, 6A
C.¯, 4A
D.­, 4A
E.¯, 2A


3. A battery is connected across a parallel combination of two identical resistors. If the potential difference across the terminals is V and the current in the battery is i, then:
A.the potential difference across each resistor is V and the current in each resistor is i
B.the potential difference across each resistor is V/2 and the current in each resistor is i/2
C.the potential difference across each resistor is V and the current in each resistor is i/2
D.the potential difference across each resistor is V/2 and the current in each resistor is i
E.none of the above are true


4. A total resistance of 3.0 W is to be produced by combining an unknown resistor R with a 12 W resistor. What is the value of R and how is it to be connected to the 12 W resistor?
A.4.0 W, parallel
B.4.0 W, series
C.2.4 W, parallel
D.2.4 W, series
E.9.0 W, series


5. Four 20-W resistors are connected in series and the combination is connected to a 20-V emf device. The potential difference across any one of the resistors is:
A.1 V
B.4 V
C.5 V
D.20 V
E.80 V


6.

Each of the resistors in the diagram is 12 W. The resistance of the entire circuit is:




A.5.76 W
B.25 W
C.48 W
D.120 W
E.none of these


7. Two identical batteries, each with an emf of 18 V and an internal resistance of 1 W, are wired in parallel by connecting their positive terminals together and connecting their negative terminals together. The combination is then wired across a 4-W resistor. The potential difference across the 4-W resistor is:
A.4.0 V
B.8.0 V
C.14 V
D.16 V
E.29 V


8. A 120-V power line is protected by a 15-A fuse. What is the maximum number of "120 V, 500 W" light bulbs that can be operated at full brightness from this line?
A.1
B.2
C.3
D.4
E.5


9.

Suppose the current charging a capacitor is kept constant. Which graph below correctly gives the potential difference V across the capacitor as a function of time?




A.I
B.II
C.III
D.IV
E.V



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