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Electricity Unit Review

Authored by Justin Blevins

Physics

7th Grade

Used 13+ times

Electricity Unit Review
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20 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

3.10 - In an electrical circuit the charges must be introduced into the circuit and do not already exist within it.

True
False

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

3.10 - In a closed circuit an energy source does what?

breaks and opens the circuit
transfers energy to the already existing charges.
acts as an insulator to hinder energy transfer
creates energy

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

3.11 - This diagram shows what type of circuit?

Circular
Open
Portioned
Closed

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

3.11 - This image shows what kind of a circuit?

Circular
Closed
Portioned
Open

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

3.15 - When energy travels through a circuit to an electrical device ____________.

an energy transformation takes place which can change the form of energy to light, heat, etc.
Some of the energy is destroyed and that is why batteries die.
the electrical device uses up the energy.
that energy cannot be transformed.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

3.15 - Which description below is best at explaining the energy transformations that take place when a light switch is turned on and lights come on in a room.

Electromagnetic to chemical kinetic to thermal
electrical potential to electrical kinetic to electromagnetic(light) and thermal(heat)
electrical potential to electrical kinetic to sound and electrical potential
chemical potential to electrical kinetic to light and kinetic

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

3.16 - Resistance can be described as ________.

The rate or speed at which electrons are able to flow through a circuit or material.  Measured in amperes with an ammeter.  Can be thought of as how fast water is flowing in a river.  If there is a fast “current,” then there is lots of water moving past a location every second.  If there is a slow “current,” there is not much water moving past the location each second.
A series of electrical devices linked together to form a chain that can be used to explain energy transformations.
A measure of a material’s opposition to the flow of electrical current.  Measured in ohms (Ω) with an ohmmeter.  Can be thought of as how difficult it is for water to move down a river.  If there are lots of rocks or if the stream is very narrow, than the water will meet lots of resistance.  On the other hand, if the stream is wide and clear of debris, the water will flow quickly and without much resistance.
The flow of electrons freely throught a circuit in which the energy transformations are contained in a directional pattern

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