_ _ _ _ _ _ _ _ _ _ _ _ _ _ _rest point equilibrium _ _

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• _ _ _ _ _ _ _ _ _ _ _ _ _ _ _rest point
  (equilibrium) _ _

Wave speed
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Reflection
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Refraction
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http//ircamera.as.arizona.edu/NatSci102/lectures/
light.htm
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Electromagnetic (E-M) Radiation

• Transverse waves
• Do not need a medium

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Static Conductor insulator
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Electroscope
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Resistance

• 1. Type of material
• materials such as tungsten (filament in light
  bulbs) are very resistant to e- flow
• higher resistance changes electrical energy into
  thermal energy light

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Resistance

• 2. Size of conductor
• Thin wires have higher resistance
• Thick wires have low
• Short wires have less resistance
• Long wires have more

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Ohms Law

• Potential difference current x resistance
• V I x R
• VVoltage V
• ICurrent A
• RResistance ?

voltage
current
resistance
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• A. Req
• B. I circuit
• C. I each resistor
• D. V circuit
• E. V each resistor

6.75?
12V
15.3?
21.6?
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• A. Req
• B. I circuit
• C. I each resistor
• D. V circuit
• E. V each resistor

120?
24V
41?
8?
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Electrical Power

• the rate at which electrical energy is converted
  to another form of energy
• Measured in Watts (W) (or kW)
• Powercurrent x voltage
• P I x V
• W A x V

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Electrical Energy

• The amount you use depends on the power required
  by appliances how long they are used.
• EnergyPower x time
• E P x t
• kWh kW x h
• Unit is the kilowatt-hour

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• Strength of electromagnet can be increased by
• inserting iron core
• adding more turns to the wire
• increasing the amount to the current

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Faraday Electromagnetic induction
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• Direct current (DC) - current flows in one
  direction, example is dry cell batteries
• Alternating current (AC) - current reverses
  direction in a regular pattern

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• Advantages
• current flows indefinitely
• eliminates electrical waste
• Disadvantages
• brittle, hard to shape into wires
• need to be cold in order for it to work

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THE END