Electricity, Sound and Light

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# Electricity, Sound and Light - PowerPoint PPT Presentation

Electricity, Sound and Light Chapter Eight: Electricity and Magnetism 8.1 Electricity 8.2 Electrical Circuits and Electrical Power 8.3 Properties of Magnets 8.2 Electric Circuits and Electrical Power An electric circuit is a complete path through which electric current travels.

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Presentation Transcript
Chapter Eight: Electricity and Magnetism
• 8.1 Electricity
• 8.2 Electrical Circuits and Electrical Power
• 8.3 Properties of Magnets
8.2 Electric Circuits and Electrical Power
• An electric circuitis a complete path through which electric current travels.
• A good example of a circuit is the one found in an electric toaster.
8.2 Current in a circuit
• Current only flows when there is a complete and unbroken path, or a closed circuit.
• Flipping a switch to the “off” position creates an open circuit by making a break in the wire.
8.2 Current in a circuit
• The amount of electric current flowing into any part of a circuit must be the same as the amount flowing back out.
8.2 Electrical power
• Electrical power is measured in watts, just like mechanical power.
• A 100-watt electric light bulb uses 100 joules of energy every second.
8.2 Electrical Power
• To calculate power in an electric circuit you multiply the voltage and current together.

What is the power in this circuit?

8.2 Resistance
• Resistance(R) controls how much current flows for a given voltage.
• When resistance is low, current flows easily.
8.2 Resistance

This light bulb has a resistance of 1 ohm.

• Electrical resistance is measured in ohms.
• If a circuit has a resistance of 1 ohm, then a voltage of 1 volt causes a current of 1 amp to flow.
8.2 Ohm’s law
• The current in a circuit depends on voltage and resistance.
• Ohm’s law relates current, voltage, and resistance with one formula.
8.2 Ohm’s law
• Voltage and current are directly related.
• Doubling the voltage doubles the current.
• Resistance and current are inversely related.
• Doubling the resistance cuts the current in half.
• If you know two of the three quantities, you can use Ohm’s law to find the third.