DC Circuits

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mschival  on May 17, 2012

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Physics Final Exam Review

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DC Circuits

 C) Electric forces cause objects to repel or attract each other.Which of the following statements is true about electric forces? A) Electric forces cause objects to only attract each other. B) Electric forces cause objects to only repel each other. C) Electric forces cause objects to repel or attract each other. D) Electric forces have no effect on each other.
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C) Electric forces cause objects to repel or attract each other. Which of the following statements is true about electric forces?
A) Electric forces cause objects to only attract each other.
B) Electric forces cause objects to only repel each other.
C) Electric forces cause objects to repel or attract each other.
D) Electric forces have no effect on each
other.
Rod P Rod Q Rod R
C) - - +
Three rods of different materials P, Q, and R, are charged by various methods. When the rods are brought near each other, the rods P and Q repel each other, while the rods P and R attract each other.
Which of the following could be the signs of the charges on the rods?
Rod P Rod Q Rod R
A) - + -
B) - + -
C) - - +
D) - - -
A) Wet skin Which of the following materials is the best conductor of electricity?
A) Wet skin
B) Glass
C) Dry air
D) Rubber
D) Ohm's law Which of the following does not affect a material's resistance?
A) the length of the material
B) the type of material
C) the temperature of the material
D) Ohm's law
D) a copper wire 5 cm in length Which of the following wires would have the least resistance, assuming that all of the wires have the same cross-sectional area?
A) an iron wire 10 cm in length
B) an iron wire 5 cm in length
C) a copper wire 10 cm in length
D) a copper wire 5 cm in length
B) the resistance, the current, and the time the circuit operates Which set of information will allow you to calculate the kilowatt•hr usage?
A) the voltage and current in the circuit
B) the resistance, the current, and the time the circuit operates
C) the voltage and the resistance of the circuit
D) the current and the time the circuit operates
I1 + I2 + I3 Three resistors connected in parallel carry currents labeled I1 , I2 , and I3 . What is an expression for the total current It in the combined system?
R1 + R2 + R3 Three resistors with values of R1 , R2 , and R3 are connected in series. What is an expression for the total resistance, Req , of the three resistors?
a closed circuit A circuit has a continuous path through which charge can flow from a voltage source to a device that uses electrical energy. What is the name of this type of circuit?
\$0.29 A color TV draws about 2.7 A when it is connected to a 120 V outlet. Assuming electrical energy costs \$0.060 per kW•h, what is the cost of running the TV for exactly 15 h?
157.5 V If a lamp has a resistance of 248 ohms when it operates at a power of 1.00 × 102 W, what is the voltage across the lamp?
9.7 ohms If a 325 W heater has a current of 5.8 A, what is the resistance of the heating element?
0.13 A If a 15 W lightbulb operates at a voltage of 120 V, what is the current in the bulb?
ammeter Which device measures the current in a circuit?
circuit breaker An automatic switch that opens when the current reaches a set value is called:
5.0 A A 4.00-ohms resistor and a 12.0-ohms resistor are connected in parallel across a 20.0-V battery. What is the current flowing through the 4.00-ohms resistor?
240.0 V A 20.0-ohms resistor and a 40.0-ohms resistor are connected in series across a battery. If the current is 4.0 A, what is the voltage of the battery?
127.5 ohms Four resistors of 30.0 ohms each are connected in parallel. A combination of four resistors of 30.0 ohms each is connected in series along with the parallel arrangement. What is the equivalent resistance of the circuit?
4.0 F The distance between two charges qa and qb is r, and the force between them is F. What is the force between them if the distance between them is quartered?
excess electrons within the sphere move toward excess protons When a conducting sphere is charged positively, initially the charge is deposited on the left side. However, due to the sphere's conducting nature, the charge spreads uniformly throughout the surface of the sphere. Charge is uniformly distributed because:
conservation of charges When two bodies are charged, the total charge before and after charging remains the same because of:
electrically neutral A negatively charged balloon sticks to a wooden door. However, an uncharged balloon does not stick to a wooden door. What is the nature of the charge on the wooden door?
2.2 A A 5.0-ohms resistor, 20.0-ohms resistor, and 25.0-ohms resistor are connected in series across a 110-V supply. Calculate the current in the circuit.
fuse A short piece of metal that melts when a large current passes through it is a:
current In a series circuit, each circuit element has the same:
decreases If a resistor is added to a parallel circuit, the equivalent resistance:
one The number of current paths in a series circuit is:
increases If a resistor is added to a series circuit, the equivalent resistance:

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