Electricity Study Guide

A fuse is used to protect electric circuits from too much energy running through them. How should a fuse be hooked to the components it is designed to protect?

A fuse should be hooked up in a series because all of the current must flow through the fuse in a series circuit

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

All 3 bulbs will glow

An advantage of parallel circuits is that they_____

Allow current to flow even if some paths are cut

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

Direct, move in only one direction

An electrician is wiring a house. He needs to make a plan that allows the owners to turn off lights in one room without turning off lights in another. What should he do?

He should wire each room in parallel with the next.

Advantage of parallel circuits?

If the light bulbs were the output devices, if one bulb broke the others would stay lit.

A circuit contains 3 light bulbs in parallel. A 4th light bulb is added, also in parallel. How does the intensity of the of the fourth light bulb compare with intensity of the other 3 bulbs?

It is the same

What is an advantage to series circuits?

More power sources can be added, like batteries, and increase the force of the output which gives more POWER

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

None of the devices will work

A series circuit contains 4 light bulbs. The switch is opened and one of the bulbs is removed, but not replaced. The switch is closed again. What do you expect to see?

None of the remaining light bulbs will be on

If electricity goes off as a result of a blown fuse a(n) _______ has been created and the electrical current is stopped.

Open circuit

The following statements are all true for what type of circuit? Voltage is the same in each path there is more than one path for electrons to reach resistors The total current in a circuit will increase when a path is added

Parallel

Series circuit or parallel? Current across each component is the same

Series

Series circuit or parallel? Total resistance is equal to the sum of the individual resistances

Series

The following statements BEST describe a (n) __________ circuit. There is a single path for electrons The current decreases when additional resistors are added The current will be the same in each resistor

Series

Chemical cells wired in a series make the battery last _______ those in a parallel. Given both circuits receive the same load over the same time period.

Shorter than

Which statement is true about a series circuit when more light bulbs are added?

The bulbs will dim

4 light bulbs are connected in a circuit. You add another light bulb, what is true about the current in each bulb?

The current will remain the same

A series circuit includes a battery and a tiny fan. How will the circuit behave if closed?

The fan will blow

Three identical light bulbs are connected in parallel to a battery. What happens when one of the bulbs is removed from the socket?

The other bulbs remain on and will be equally bright

Each light switch in the classroom allows you to turn on one row of lights. What conclusion can you make about how the rows of lights are connected?

The rows must be hooked up in parallel or all the rows of light would turn on or off.

A strand of 10 lights is plugged into an outlet. How can you determine if the lights are connected in a series or parallel?

Unscrew one bulb. If the other bulbs turn off, it is a series circuit.

A light bulb glows when electrons flow through it. As the electron flow increases, the brightness increases. A student hooks up 2 circuits with 3 bulbs in each circuit. In one circuit the lights are connected in series and in the other circuit the lights are hooked up in parallel. If you could only see the lights in the circuit and the wires were covered up, how could you tell the type of circuit?

Unscrew one light, if the others remain on it is a parallel circuit.

How does electrical energy move when a l;amp is switched on?

Wires in an clerical circuit carry the electrical energy

What is a disadvantage of parallel circuits?

You can add more power sources, like batteries, and not increase the output to give more power.

Series circuit or parallel? Current across each component/branch depends on the resistance of that component/branch

parallel

Series circuit or parallel? Total resistance depends on the sum of the inverses of the individual resistances

parallel

Series circuit or parallel? Voltage across each component/branch is the same

parallel

Series circuit or parallel? Voltage across each component/branch depends on the resistanceof that component

series

When using a series circuit to connect 4 small light bulbs, which statement is most accurate? A. If 1 bulb fails, the other three will still work B. The current passing through each light bulb will be the same C. By adding more light bulbs in the series, it will draw less on the power source

B. The current will remain the same...

Two circuits are created by using two identical bulbs. In circuit A, the bulbs are hooked up in a series. In circuit B, the light bulbs are hooked in parallel. Each circuit is powered by a 6-volt battery. What observation would NOT be supported? A. Circuit A current would be less B. The bulbs in circuit B would be brighter C. If one bulb burns out in circuit A, the other bulbs get brighter

C. If one bulb burns out in circuit A, the other bulbs get brighter