Electricity Review

Electricity 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.

Visualizing Current

• The negative terminal of a battery has tons of electrons.

• When forced, they leave, complete the circuit, and return to the positive terminal.

• Resistors slow them down.

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.

Ammeters

• Measures the current traveling through the circuit.

• Have a very low resistance.

• Must be connected in series to work properly.

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.

What questions do you have?

We will review everything from this unit!

Multiple Choice

The amount of "push" available to move electrons is _____

• Current

• Resistance

• Voltage

• Static Electricity

Multiple Choice

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

Multiple Choice

Which way do electrons flow?

• Positive to negative

• Negative to positive

• Negative to Negative

• Positive to Positive

Multiple Choice

The opposition to electron movement

• Voltage

• Static electricity

• Current

• Resistance

Multiple Choice

If a bulb is added between the battery and the switch, ____

• The bulbs get brighter

• The bulbs get dimmer

• The bulb brightness stays the same

• All the bulbs go out

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 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

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

The mathematical relationship among Voltage, Current, and Resistance

• Faraday's Law

• Tesla's Law

• Edison's Law

• Ohm's Law

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

Multiple Choice

The resistance of a component in a circuit is found using an ammeter and a voltmeter.

How are the ammeter and the voltmeter connected?

• the voltmeter and ammeter in parallel with the component

• the voltmeter and ammeter in series with the component

• the voltmeter in parallel with the component and the ammeter in series with the component

• the voltmeter in series with the component and the ammeter in parallel with the component

Poll

How confident do you feel about Electricity after this review?

• Totally Lost

• Kinda Lost

• Neutral

• Kinda Got It

• Totally Got It