Chapter Review

Calculate the total resistance in a series circuit made up of resistances of 3Ω, 4Ω, and 5Ω.

12

In this circuit, assume that R1 = R2. If V = 24 V, calculate the potential drop across AB.

12

The relationship between voltage, charge flow, and resistance is expressed by law.

Ohm's

If a resistance is added in series to a circuit, the circuit resistance is then: greater the same less

greater

The unit of electrical resistance is the: ampere volt ohm mho

ohm

The unit of emf is the: volt ampere ohm ohm-cm

volt

A device that measures potential is a(n) circuit.

voltmeter

The unit of electrical power is the: ampere joule watt ohm

watt

In a parallel circuit, the potential drop across one of two 6Ω resistors is 0.4 volts. The potential drop across the second resistor is: 0.4 volts 0.8 volts 0.2 volts 0 volts

0.4 volts

A 60-watt bulb is plugged into standard house voltage of 120 volts. Calculate the current through the bulb. _______ amps 0.5 2 7000 30

0.5

A series circuit contains both a 6Ω and a 3Ω resistor. Through the 6Ω resistor, the current is 0.5 amps. What will the current be through the 3Ω resistor? 1.0 amps 3.0 amps 0.25 amps 0.5 amps

0.5 amps

Calculate the total resistance in a parallel circuit made up of resistances of 2Ω, 3Ω, and 4Ω. (Hint: When converting to a decimal from a fraction, keep the same number of significant figures in the decimal as was present in the original measurement from which the fraction was derived.)

0.91

Calculate the resistance of a 270-cm length of copper wire with a 0.030-cm2 cross-sectional area. ( = 1.8 · 10-6 ohm-cm) R = _____Ω 5.4 x 10-1 5.0 x 109 2.0 x 10-18 1.6 x 10-2

1.6 x 10-2

Calculate the power developed in a 6.0Ω resistor by a current of 2.0 amps. P = _____ watts 1.5 3.0 12 24

24

Calculate the power developed in a 6.0Ω resistor with a potential drop of 12 volts. P = _____ watts 0.0012 2 24 860

24

Calculate the current in a circuit whose total resistance is 4 ohms and whose emf is 12 volts. I = _____ amps 0.3 3 5 50

3

In this circuit, assume that R1 = R2. If V = 6 V, calculate the potential drop across AB.

3

A 60-watt bulb is plugged into standard house voltage of 120 volts. Calculate the energy in joules consumed by the bulb in 24 hours. (Round answer to nearest tenth.) E = __________ J 6 x 108 5 x 106 2 x 105 4 x 104

5 x 106

A device in electricity that is analogous to a water pump is: a resistance a generator a conductor an ammeter

a generator

A device that measures current is a(n) circuit.

ammeter

The fact that current is uniform anywhere in a series circuit is an application of the principle of: Newton's second law conservation of charge conservation of energy Coulomb's law

conservation of charge

The total circuit resistance is 6 ohms. If a second 6-ohm resistor is placed in parallel with the first, the total circuit resistance

decreases

Voltage across a resistor.

drops

In a series circuit containing two unequal resistors, higher power is developed in the resistor.

higher

If a resistance is added in parallel to a circuit, the circuit resistance is then: greater the same less

less

Total circuit resistance is equal to the emf divided by the of the circuit.

potential current

Given the circumstances of the previous problem, the current through the first 6-ohm resistor will

remains constant

A device in electricity that is analogous to a restriction in a water pipe is: resistance a generator a conductor an ammeter

resistance

In any circuit, current is inversely proportional to: potential resistance emf voltage

resistance

A circuit in which current has a single path is a circuit.

series