Physics help?

Posted on 2015-11-17 07:12:00 in Physics by SPAROW

Which of the following materials could be used as an insulator of electricity?

silver
gold
copper
silicon
zinc

First, one light bulb is connected to a battery. Then, a second light bulb is connected in series to the same battery. What quantity has increased in this circuit?

resistance
current
voltage

As more resistors are connected in a parallel circuit, the overall current in the circuit:

increases.
decreases.
stays the same.

In a circuit, which particle flows from the negative terminal to the positive terminal?

proton
neutron
electron
photon

A transformer:

steps up or steps down voltage.
turns generators into motors.
transforms magnetic field lines.

Voltage can be induced in a wire by:

moving the wire near a magnet.
moving a magnet near the wire.
changing the current in a nearby wire.
all of these.

If a circuit has four resistors connected in parallel with resistances of 20 Ohms each, what is the total resistance of the circuit?

20 Ohms
5 Ohms
80 Ohms

A generator converts __________ energy into __________ energy.

mechanical, electrical
electrical, mechanical
electrical, radiant
radiant, mechanical

A kitchen mixer requires 375 W of electric power. If a voltage of 125 V is available to operate the mixer, what is the required current for its operation?

250 A
0.33 A
3 A
46,875 A

What process is responsible for the creation of a magnetic field?

The Moon orbiting around the Earth.
Electric charges in motion.
Stationary electric charges.
Cosmic radiation.

Which of the following best describes an ion?

An element with a different number of protons and electrons.
An element with the same number of neutrons but different number of electrons.
An element with the same number of protons but different number of neutrons.
An element with the same number of electrons and neutrons.

Conservation of charge means:

the total charge of an object has decreased.
an object will never gain or lose electrons.
the total charge of an object has increased.
net charge cannot be created or destroyed.

A conductor:

has more electrons than protons.
has more protons than electrons.
has tightly bound protons.
has loosely bound electrons.

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