Chapter 8 Review

A component in an automobile 12-V electrical system has a resistance of 90 Ω. How much current is in the component when in operation?

0.13 A

In a conductor, what moves?

Electrons

Which of the following would be the least conductive?

Glass

The unit for current is the

ampere.

A generator is a device that converts

mechanical energy into electrical energy.

A(n) ______________ is an elementary particle with no charge.

neutron

The unit of resistance is called a(n)

ohm.

A(n) ______________ is an elementary particle with a charge of +1.6 × 10-19 C.

proton

If a negatively charged object is brought near a suspended, negatively charged object, the suspended object will be

repelled.

The mathematical form of Coulomb's law is similar to that of

the law of gravitation.

Three resistors, 20 Ω, 10 Ω, and 80 Ω, are wired in series and connected to a 120-V battery. How much current flows in this circuit?

1.1 Α

Three resistors, 90 Ω, 40 Ω, and 60 Ω, are wired in series and connected to a 120-V battery. What is the equivalent resistance for this circuit?

190 Ω

A transformer with 600 turns on the primary coil is used to decrease the voltage from 3000 V to 120 V for home use. How many turns should be in the secondary coil?

24 turns

If a negatively charged object is brought near a suspended, positively charged object, the suspended object will be

attracted.

The direction of the magnetic field of a bar magnet is

away from the north pole.

If the voltage across a resistor is tripled, the current will

be tripled.

Electric charge is measured in units of

coulombs.

The angle between true north and the direction in which a compass needle points is called the angle of

declination.

A motor converts

electrical energy into mechanical energy.

A(n) ______________ is an elementary particle with a charge of -1.6 × 10-19 C.

electron

The electric company charges a home on the basis of consumption of

energy.

In a battery circuit with different resistors in parallel,

the voltage is the same across each resistor.

If work is done on an electric charge, a ______________ is present.

voltage

Voltage is defined as the ______________ per unit ______________.

work; charge

A system of an electron, a proton, and a neutron has a net charge of

zero.