QQ Two wires of equal length are made from the same material. How is it possible for the wires to have different resistances? If a circuit has a voltage of 45 V and a current of 5.0 A, what is the resistance?

Thickness, Temperature, and length Two wires of equal length are made from the same material. How is it possible for the wires to have different resistances? Think: What characteristics affect a conductors ability to pass the charges (resistance)? Thickness, Temperature, and length

Temperature * Higher temp means more energy  vibration * e- trying to move, can pass around still protons easier * Length  shorter is faster

QQ If a circuit has a voltage of 45 V and a current of 5.0 A, what is the resistance? V = I R 45 = 5 * R V = 45 Volts 45 = 5 * R 5 5 Current = I = 5 Amp R = ? 9 ohms = R

Objective: I understand the relationship between Power and Current

Electrical Power: Amount of work electricity can do Watts

V= 120 Volts I = 2.2 Amps P = ? P = VI P =120 * 2.2 P = 264 Watts Luke’s stereo receiver uses a current of 2.2 amps from a 120-volt line. What is its power? V= 120 Volts I = 2.2 Amps P = ? P = VI P =120 * 2.2 P = 264 Watts

Direct Current: Only flows in 1 direction Example: batteries)

Alternating Current: Flow regularly reverses direction Example: Household currents

AC/DC ????

Series Circuit: 1 Path One element doesn’t work, nothing works. The current stops.

Parallel Circuit: More than 1 path One element doesn’t work, the current goes around it.

Circuit Diagrams: Show the flow of electricity

Wire & Power Source (battery) Draw A Simple Circuit: Wire & Power Source (battery)

Add Switch:

Add Resistance:

Add Light Bulb

Create A Series circuit with a switch, a battery, and 2 light bulbs.

Create A Parallel Circuit with a battery, 2 light bulbs, and NO switch.

Create A Parallel Circuit with 3 bulbs, a switch and 2 connected batteries.

Create A Series Circuit with 3 lights, a battery and a switch Create A Series Circuit with 3 lights, a battery and a switch. Label the lamps A, B, & C.

An Electric Highway

Hyperlink to 12 minute video followed by quiz