Electricity Review

Ohm's Law

Ohm's Law

V = I x R

Symbol for Voltage

V

Symbol for Resistance

R

Symbol for Current

I

Units for Voltage

Volts

Units for Resistance

Ohms

Units for Current

Amps

Parallel Circuit

bulbs are same brightness as when alone, remove one bulb and the other stays lit

Series Circuit

bulbs are dimmer than when alone, remove one bulb and other goes out

Water analogy for Voltage

like a water "pump"

Water analogy for Current

like the "flow" of water

Water analogy for Resistance

like something "blocking" the water

As Resistance increases, current ________

decreases

As Voltage increases, current _______

increases

Opposite charges ______

attract

Same (or "alike") charges _____

repel

A light bulb is an example of a _______

resistor

Electrolyte

blocks electrons and pushes them out of battery

Anode

the "negative" side of the battery

Cathode

the "positive" side of the battery

Everything is made of _______

atoms

electrons

have a negative charge

protons

have a positive charge

neutrons

have a neutral charge

To increase voltage you should _____

add batteries

short circuit

caused a "fire" in the simulation

ammeter

measures current

Waves and Sound

Our next unit in science

12 Volts

I = 4 Amps, R = 3 Ohms, V=?

10 Volts

I = 5 Amps, R=2 Ohms, V=?

5 Ohms

V = 15 Volts, I = 3 Amps, R=?

2 Ohms

V = 20 Volts, I = 10 Amps, R=?

5 Amps

V = 35 Volts, R = 7 Ohms, I=?

2 Amps

V = 2 Volts, R = 1 Ohm, I=?