Which circuit contains the GREATEST voltage?

A circuit with 25 amps and a resistance of 16 ohms

A circuit with 20 amps and a resistance of 16 ohms

A circuit with 10 amps and a resistance of 10 ohms

A circuit with a current of 20 amps and a resistance of 10 ohms

Choose the false statement regarding resistance.

Longer wires have less resistance

Electrical resistance produces heat.

Resistance slows the flow of current

The larger the diameter, the wire, the less resistance.

In a closed circuit containing one resistor and a battery, if the voltage in the battery increases, the current going through the resistor increases. Why does this occur?

as the electrons are pushed more by the battery, they move faster through the circuit

as the electrons are sped up, they bunch closer together

As the electrons have more energy, they vibrate more rapidly

as the distance around the circuit increases, the electrons take longer to travel around

How does current flow in a standard DC circuit?

from the negative to the positive terminal

directly to the resistor and back

changing direction at a regular frequncy

from the positive to the negative terminal

When using a series circuit to connect four small light bulbs, which statement is most accurate?

The current passing through each bulb will be exactly the same.

If one bulb fails, the other three can remain operational.

By adding more light bulbs in the series, it will draw less on the power source.

As more light bulbs are added in series, the brightness of the bulbs will stay the same.

During physical science class, Ben and Jerry connected three identical light bulbs in parallel to a battery. What happens when Ben moves one of the light bulbs from its socket?

The other light bulbs remain on and will be equally bright.

The other light bulbs remain on, one brighter and the other less than bright than before.

The other light bulbs remain on, one less bright and the other the same brightness as before.

One disadvantage of a series circuit is

as more lights are added to the circuit, the voltage to each decreases

the addition of new light bulbs decreases resistance

as more lights are added to the circuit, the current to each increases

when the current to one light is turned on, the current to the other lights turns off

One advantage to using a parallel circuit is that

voltage available to each light remains constant regardless of the number of lights hat are on.

current drawn from the battery remains constant regardless of the number of lights that are turned on.

resistance along the circuit remains constant regardless of the number of lights that are on.

current drawn from the battery decreases as more lights are turned on.

Three light bulbs are connected to a battery in a series circuit. How will the bulbs behave if the circuit is closed?

Only the bulb farthest from the battery will glow.

Only the first bulb closest to the battery will glow.

None of the bulbs will glow, but the battery will heat up.

A light bulb, a fan, and a tiny speaker are connected to a battery in a series circuit. How will the circuit behave if it is open?

The battery will heat up and explode.

Only the device closest to the battery will work.

The bulb will light, the fan blow, and the speaker will make noise.

A fan is connected to a battery in a series circuit. What kind of energy transfer occurs if the circuit is closed?

Chemical energy changes to mechanical energy

Light energy changes to chemical energy

Thermal energy changes to mechanical energy

Mechanical energy changes to chemical energy

A strand of ten lights is plugged into an outlet. How can you determine if the lights are connected in a series of parallel?

Unscrew one light. If the other lights turn off, it's a series circuit.

Unscrew one light, if the other lights stay on, it's a series circuit.

Unplug the strand. If the first light stays on, it's series circuit.

Cut the strand in half. If the plugged in half stays on, it's a series circuit.

Direct current, DC< flows in a _______ direction while the alternating current, AC, the direction of flow _______.

constant, periodically reverses

opposite direction, is multiple

periodically reversing, is constant

Why might an electromagnet be used to pick up old cards in junk yards?

Electromagnets are powerful and can be turned on and off easily.

Electromagnets are inexpensive and easily create revenue.

Electromagnets are easy to operate and can be run by cheap labor.

Electromagnets are versatile and can pick up metallic objects in the yard.

In an electric motor, an electric current causes the coil to rotate, changing:

electrical energy to mechanical energy

magnetic energy to electrical energy

electrical energy to a magnetic force

potential energy to electrical energy

Sal and Marie were experimenting with bar magnets in science class, picking up chains of paper clips. Where should they expect the magnetic force of the bar magnet to be the strongest and pick up the most paper clips?

in the center of the bar magnet

The atoms in a magnet are:

aligned according to magnetic fields

Which configuration would produce an electric current?

Rotate a coil of copper wire between two magnets.

Connect a wire between a copper and zinc strip sitting in a beaker of water.

Connect a wire to the negative end of a battery and the other end to a light bulb.

The magnetic force of a magnet is

the same at all parts of the magnet

The north pole of one magnet will be

repelled by the north pole of another magnet

attracted to the north pole of another magnet

attracted to the south pole of the same magnet

repelled by te south pole of another magnet

Like magnetic poles always

cancel out each other's magnetic field

The strength of a magnetic field created by current in a wire can be safely increased by:

increasing the current in the wire

decreasing the current in the wire

In a magnetized substance, the domains:

line up more uniformly in one direction

Which factor is MOST essential for the induction of the electric current?

the movement of the magnet relative to the coil

the use of very long coils for the process

the use of strong magnets for the process

the use of magnetic material to make the coil

A coil of wire, a battery, a few paper clips, and a thermometer are on a table of supplies. What other material or materials would be needed for a student to construct a basic electric motor?

alligator clips and a plastic cup

A table has several directional compasses, several lengths of wire, an iron nail, a battery, an ammeter, a light bulb, a permanent magnet, several metal and a rubber eraser. A student is asked to build an demonstrate a working temporary magnet. From the items on the table, which items can be used together to accomplish this task?

A battery, and iron nail, a wire, and several paper clips will accomplish this task.

An ammeter, and iron nail, a wire, and several paper clips will accomplish this task.

A battery, a wire, a permanent magnet, and several paper clips will accomplish this task.

A battery, an iron nail, a permanent magnet, and several paper clips will accomplish this task.

Electricity and Magnetism

Physics

KG - University

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The potential energy of an electric current is measured in units of

amperes

ohms

volts

watts

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An electrical wire gets hot when operating because of

current

power

resistance

voltage

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The electrical conductivity of a substance depends on the ability of the _______ in it to move.

electrons

neutrons

protons

quarks

What process is the method by which a neutral object obtains an electrical charge?

convection

discharge

induction

radiation

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Pretend you are an electron in a copper wire which is being used to connect a battery to a flashlight bulb. Because this circuit uses a(n) ________ current, you as the electron in the wire will

alternating, move first one way then the other

direct, move first one way then the other

alternating, move only in one direction

direct, move only in one direction

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Pretend you are an electron flowing through this circuit and you are with a group of other electrons. Suddenly you come to the "fork in the road" and you and some of the other electrons are temporarily separated. A short while later, you are back together with the other electrons. This type of circuit is called a(n) _______ circuit.

closed

open

parallel

series

In order for a light bulb to be on, the circuit must be

closed

open

parallel

series

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Electricity and Magnetism

The potential energy of an electric current is measured in units of

An electrical wire gets hot when operating because of

The electrical conductivity of a substance depends on the ability of the _______ in it to move.

What process is the method by which a neutral object obtains an electrical charge?

Pretend you are an electron in a copper wire which is being used to connect a battery to a flashlight bulb. Because this circuit uses a(n) ________ current, you as the electron in the wire will

In order for a light bulb to be on, the circuit must be

Which circuit contains the GREATEST voltage?

Choose the false statement regarding resistance.

A battery-operated DVD player uses 12 DC volts from AA batteries and draws a current of 3 A. Calculate the resistance.

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