Chapter 5 Study Guide (From Quiz)

Some migratory birds use the following to guide them on long flights: A. Earth's magnetic field B. Static electricity C. Lightening D. Electrical signals from the Earth

A

Static electricity exists when there is an unbalance among the number of: A. Electrons B. Calories C. Temperature D. Newtons

A

The voltage across a resistor is 20 V and the current through it is 10 A. What is the resistance of the resistor? A. 2 ohms B. 10 ohms C. 30 ohms D. 200 ohms

A

Electric fields and electric currents can be produced by: A. changing magnetic fields B. static electrical charges C. magnetic monopoles D. radiation

A

How much amperage will be moving through a wire if it has a resistance of 12 ohms and is carrying 120 V? A. 10 Amps B. 1.2 Amps C. 1 Amp D. 12 Amps E. 100 Amps

A

In his famous experiment of the late 1700s, Charles Coulomb: A. measured the force of the electric charge in objects B. measured static electricity using a piece of amber C. proved Newton's three laws of motion D. repeated Benjamin Franklin's kite and lightning demonstration

A

A particular electrical appliance requires 30 W. When it is connected to a power source that provides 120 V, the current in the circuit is: A. 4 A B. 0.25 A C. 3600 A D. 120 A

B

Electricity and magnetism are: A. Both travel as waves that can be clearly seen by the human eye B. Two aspects of one force C. Completely different, unrelated forces D. One is physical and the other is theoretical

B

In the equation for Ohm's law, resistance is in the unit: A. watts B. ohms C. amps D. volts E. coulombs

B

In what way does Newton's law of universal gravitation differ from Coulomb's law? A. Only Coulomb's law addresses distance in describing the effect of one object on another. B. Electrical forces can be either attractive or repulsive, while gravity is only attractive. C. Newton's and Coulomb's laws are really identical, so there is no significant difference. D. Only Newton's law of gravity requires a universal constant. E. Newton's law required experimentation but Coulomb's law did not.

B

The current in a circuit is 0.5 A and the voltage across it is 12 V. The power being supplied by the source is: A. 11.5 V B. 6 W C. 24 A D. 12.5 W

B

Voltage is calculated with the following formula: A. Power x Resistance B. Current x Resistance C. Power/Time D. Current / Resistance

B

When electric charges are in motion, we have: A. a battery B. current C. voltage D. a wire

B

Which device would most likely be running on DC electricity?(Hint: Which one requires an adapter to plug into the wall?) A. microwave B. your cell phone C. toaster D. oven E. television

B

Who showed that electrical forces could be used to do work, i.e., demonstrated the first electrical generator? A. George Coulomb B. Michael Faraday C. Benjamin Frankline D. Isaac Newton

B

A bar magnet is magnetic even when no electric current is passing through it. Why? A. Magnetic fields are attracted to bar magnets and, by Newton's 3rd Law, there are magnetic fields in the bar magnet B. Individual magnetic poles are distributed throughout a bar magnet C. Bar magnets take advantage of the electrons moving around in atoms to create a magnetic field D. Bar magnets concentrate the Earth's magnetic field

C

Approximately how much power is consumed per hour by an electric stove drawing 40 Amps? (Note - This electric stove is plugged into a 240 Volt wall socket.) A. 9600 kiloWatts/hour B. 5.75 kiloWatts/hour C. 9.6 kiloWatts/hour D. 345 Watts/hour E. 6 Watts/hour

C

Electrical current is measured in A. Ohms B. Coulombs alone C. Amps D. Volts

C

One amp of electrical current is equal to A. one volt times one amp B. one thousand watts per hour C. one coulomb of charge per second D. one newton per second

C

The unit for electric current is which of the following? A. Volt B. Coulomb C. Amp D. Ohm

C

DC refers to: A. Alternating resistance B. Direct voltage C. Alternating current D. Direct current

D

The current through a 5.0-Ω resistor is 0.40 A. What is the voltage across the resistor? A. 0.8 V B. 5.4 A C. 4.6 V D. 2.0 V

D

Which of the following can produce magnetic fields? A. gravitational force B. static electric charges C. flowing water or other liquids D. moving electrical charges

D

Conductors are materials with relatively low A. Objectivity B. Conductivity C. Voltage D. Entropy E. Resistance

E

Ohm's Law states: A. voltage (volts) = pressure (ohms) × resistance (ohms) B. power (watts) = current (amps) × voltage (volts) C. electrical pressure = flow charge/flow resistance D. current = voltage (volts) + flow charge (coulombs) E. voltage (volts) = current (amps) × resistance (ohms)

E