Electricity Assessment Review

Electricity Assessment Review

Current

• The movement of electrons.

• Flows from high potential energy to low potential energy.

• Electrons need a force to begin moving along a circuit.

V = Voltage / I = Current / R = Resistance

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.

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.

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

What form of energy is stored in a battery?

• chemical energy

• gravitational potential energy

• kinetic energy

• thermal energy

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

Multiple Choice

Electrons move out the negative terminal of a battery because

• Like charges attract- Electrons are + charged therefore they move through a wire to get to the + terminal

• Opposite charges attract- Electrons are - charged therefore they move through a wire to get to the + terminal

• A battery always has two negative terminals

• Electrons heat up too quickly if kept inside a battery

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

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

Which model best represents the relative amounts and locations of charges in a charged battery?

Multiple Choice

If the top bulb goes out,

• All the bulbs go out

• The other bulbs get dimmer

• There is no effect on the other bulbs

• The other bulbs get brighter

Multiple Choice

If the middle bulb goes out, _______

• The other bulb gets brighter

• The other bulb goes out

• The other bulb's brightness stays the same

• The other bulb gets dimmer

Multiple Choice

If you add another bulb in parallel,_____

• The bulbs get brighter

• The bulbs get dimmer

• The bulb brightness stays the same

• All the bulbs will go out

Multiple Choice

What is current measured in?

• Ω (Ohms)
• V (Volts)
• A (Amps)
• W (Watts)

Multiple Choice

Voltage divided by Resistance (V / R) equals

• Current

• Power

• Ohms

• Watts

Poll

How confident do you feel about Electricity after this review?

• Totally Lost

• Kinda Lost

• Neutral

• Kinda Got It

• Totally Got It