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Presentation transcript:

Check your Understanding Draw a Circuit with: The electron flow going counter clockwise 1 – light bulb 1 – Closed switch 1 – resistor 1 – battery

Potential Difference Potential Difference (voltage) = The amount of electrical potential that an electron possesses between two points. Or The amount of energy an electron possesses. The SI unit for voltage = volt (V)

Measuring Voltage V - Voltage meter

Drawing a Volt meter Rules: - Volt meter attaches at two points - Attaches around a load or battery

4 electrons/sec

Current Current: Is the amount of electric energy (or electrons) that pass through a point in one second Current is measured in Amperes SI units: Amp (A)

Drawing a Ammeter A Rules: - Ammeter is attached into the circuit

Resistance Aluminum Copper

Resistance Resistance = The amount that a substance opposes the flow of electrons SI units: Measured in Ohms ( ) All loads add some resistance Resistance slows down the flow of electrons and releases some energy as heat

Hw: pg. 438 1 - 4 pg. 442 # 1 – 3 Draw 2 circuits: Circuit 1: 1 – light bulb 1 – volt meter (around the light bulb) 1 – battery 1 - resistor Electron flow going clockwise Circuit 2: 2 – light bulbs 1 – amp meter 1 – volt meter around the battery 1 – battery Electron flow going counter clockwise