Static Electricity

• Definition:

• Static electricity is the build-up of an electrical charge on the surface of an object.

• The reason that it's actually called static electricity is because the charges stay in one area for some time and don't flow or move to a different area.

• Rubbing the balloon on hair or even a carpet will allow it to stick to walls and even hair!

Circuit Symbols

• Battery

• Bulb

• Switch

• Resistor

Series circuits

• All elements in the circuit are in one loop

• Every electron flow through every element

• If one bulb burned out, the rest would also go out

​​Series Circuits Rules

​1. the current in the circuit is constant.

Current in all parts of the circuit is the same.

Parallel circuits

• There are several pathways or loops through the circuit

• Electrons flow through just one of those pathways

• If one bulb burned out, the rest of the bulbs would still glow

Ohm's Law - V=IR

• Shows the relationship between current, voltage, and resistance

• V is for VOLTAGE (volts)

• I is for CURRENT (amps)

• R is for RESISTANCE (ohms)

Voltage (V)

• Comes from the battery or another voltage source

• The "push" that moves electrons around the circuit

• Think of it like a water pump - without the pump, the water would just sit in the pipe and not move anywhere

Current (I)

• Electrons in the circuit flowing or moving around the circuit

• Measured in amps

• When electrons move faster, the current is greater

• Like the water flowing through a pipe

Resistance (R)

• Makes it harder for electrons to flow through the circuit

• Measured in Ohms

• Kind of like friction or sand that slows the water in the pipe down

Ohm's Law

Example 3

• How much current would flow through a circuit with 25 ohms of resistance and 100 volt battery?

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