Dynamic Electricity

What is dynamic electricity? Dynamic Electricity: This refers to electrical charges that are in motion.

Describe the pressure and flow of each situation Low flow, low pressure

Dropping a drop of water from a tall building High pressure, low flow

Describe the pressure and flow of each situation High pressure, High flow

High pressure, High flow

For these situations, you just interpreted the pressure and flow of water from different situations. You can do this with electricity as well (sort of).

How could you measure the “flow” of this situation? Measure how much water comes out over a specific amount of time.

How could you measure the “flow” of this situation? Moving electrons create electric current. Current Intensity (I) is the number of charges that flow past a point in a circuit in a second. It is measured in ________.

How can you determine the “pressure” that electrons are under? The potential difference (V) is the ”pressure” that electrons are under. More specifically, it’s the amount of energy per unit of charge, or the amount of energy transferred between two points in an electric circuit. This is also called ______________. It is measured in __________.

Circuits An electric circuit is a network in which electrical charges can flow continuously in a loop.

A circuit needs 3 things: A power supply (usually a battery). Something that uses electrical energy (ex: a lightbulb) A closed loop of wire (made from a material that conducts electricity)

Would you cross this bridge?

Make your own ”circuit”

Quick Review What is a conductor? What is an insulator?

Resistance Resistance (R) is the ability of a material to hinder the flow of electric current. This means that electrons can still flow through this portion of the circuit, but not easily. It is measured in _________.

Drawing electric circuits Symbol for battery Symbol for lamp Symbol for resistor

Alternating Current (Power) Wires Power Supply (Direct) Battery   Alternating Current (Power) Lightbulb Way 1 Lightbulb Way 2 Fuse or Breaker Switch Double Switch Resistor Buzzer Motor

Resistance!

Which is more dangerous? High current intensity (I) or high potential difference (voltage) (V) ? Current!