# OH MY! Circuits, Batteries Volts, Amps, and Ohms.

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Amps, Watts, Volts, and Ohms

oh my!Circuits, Batteries Volts, Amps, and Ohms

What is a circuit?Circuit a closed path through which ELECTRONS can flow.Think a about a race track. Cant race with out a complete track.

We can classify them in two ways.

Open electrons wont be moving

Closed electrons will be moving

Marble Analogy

Diagram from page 602 of Physical science textbook. Figure (A) is a dry cell battery and is a single cell. Figure (B) is a wet cell battery and has multiple cells. When we say cell we mean one cell, when we say battery we mean multiple cells.Wet Cell vs. Dry Cell.How their made.

Wet Cell - Lead Acid Battery

Dry Cell - Alkali Battery

Username waukee4 and password aea11Three Basic UnitsThe three basic units in electricity are:

Voltage (V) (measured in volts) Potential differenceCurrent (I) (measured in amps)Flow or number of electronsResistance (R) (measured in ohms)Tendency to oppose

Think Plumbing(dont write this!)Voltage would be like water pressure

Current is the flow rate

Resistance is the pipe size...

Another Analogy

Ohms Law!I = V/RThis states that current is equal to the voltage divided by the resistance.

This equation can be re-written to solve for any specific variable

ProblemYou have a tank filled with water connected to a hose that you are using to water the lawn

What happens if you just increase pressure in the tank?

Remember.. Ohms Law..

AnswerMore water will come out of the hose

Electricity works in the same way! Increasing the voltage will make more current flow

Volt MeterVolt meters are tools used to tell us how much voltage anything is producing

How to use a Volt meter