Electricity Assessment Review

Electricity Assessment Review

How Electricity Works

• Everything is made from Atoms. Different materials have different types of atoms.

• Surrounding the Nucleus are different layers of orbital shells which act like flight paths for electrons.

How Electricity Works

• The negative charge of the neutrons is attracted to the positive charge of the Proton.

• The outer most orbital shell is known as the Valance shell and in this shell some materials will have loosely bound electrons which can float to other Atoms.

Visualizing atoms "passing" electrons to one another as electricity flows.

Multiple Choice

Which of the following particles is NOT found in an atom's nucleus?

• proton

• neutron

• electron

Multiple Choice

Electrical current is

• The movement of electrons from atom to atom which are constantly being replaced

• When the electric charges don't move in a wire

• A measure of how well a material can conduct electricity

• How difficult it is for electrons to move through an object

Ohm's Law: V = IR

Multiple Choice

What is Resistance?

• The flow of electrons

• Electric potential difference

• A power source

• The ability to reduce the flow of electrons

Multiple Choice

Voltage divided by Resistance (V / R) equals

• Current

• Power

• Ohms

• Watts

Multiple Choice

Current times Resistance (I X R) equals

• Power

• Voltage

• Amperage

• Ohm

Multiple Choice

What is the Voltage of a circuit that has a resistance of 5 Ω and a current of 2 A?

• 25 V

• 10 V

• 2.5 V

• 0.4 V

Chemical Cells

• Produce voltage through Chemical Reactions.

• Contain two electrodes - different pieces of metal - and electrolyte.

• Stop producing voltage when the material(s) run out.

Solar Cells

• Convert the energy in sunlight to electrical energy.

• Contain a material such as silicon that absorbs light energy, knocking electrons loose so they can flow freely and produce a difference in electric potential energy.

Multiple Choice

What unit of measurement do we use to measure electrical potential energy in a battery?

• Watts

• Volts

• Amps

• Ohms

Multiple Choice

A solute whose water solution conducts electricity is called a(n)

• nonconductor

• electrolyte

• nonelectrolyte

• aqueous solution

Multiple Choice

Two different metals that lose or gain electrons in a battery.

Ex. zinc and copper

• wet cells

• dry cells

• electrolytes

• electrodes

Multiple Choice

True/False: A cell has three terminals

• true

• false, a cell has only one terminal

• false, a cell has two terminals

• false, a cell can have any number of terminals

Voltmeters

• Measures the voltage drop across a resistor in a circuit.

• Have a very high resistance.

• Must be connected in parallel to accurately measure the voltage drop.

Ammeters

• Measures the current traveling through the circuit.

• Have a very low resistance.

• Must be connected in series to work properly.

Multiple Choice

A device used to measure the electric potential energy drop from one point to another.

• voltmeter

• gauge

• ammeter

• clock

Multiple Choice

A voltmeter must have

• Low resistance so that it does affect the current through the main circuit

• High resistance so that it does affect the current through the resistor

• Low resistance so that it does affect the voltage across the resistor

Multiple Choice

An ammeter must have

• Low resistance so that it does affect the current through the main circuit

• High resistance so that it does affect the current through the main circuit

• Low resistance so that it does affect the voltage across the resistor