CSET 118: Electricity and Magnetism

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CSET 118: Electricity and Magnetism
2013-07-10 01:09:48

Science CSET
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  1. Describe and provide examples of electrostatic and magnetostatic phenomena
    • electrostatic:
    • friction from rubbing a balloon against hair draws electrons from the hair onto the surface of the balloons because the material of the balloon has a greater affinity for electrons than the hair does 
    • shock - spark of static electricity caused by a sudden electrostatic discharge
  2. Predict charges or poles based on attraction/repulsion observations
  3. Build a simple compass and use it to determine direction of magnetic fields, including the Earth’s magnetic field
    • lay a magnetized sewing needle on a thin slice of cork and let the cork float in a glass of water 
    • magnetize sewing needle by stroking it along a magnet about 50 times in the same direction
    • needle will point towards north 
    • compass shows the direction of magnetic field
  4. Relate electric currents to magnetic fields and describe the application of these relationships, such as in electromagnets, electric current generators, motors, and transformers
  5. Design and interpret simple series and parallel circuits
    • simple series circuit:
    • wires through which electrical charge flows
    • a battery or power supply to provide the voltage to push charge around the circuit 
    • a switch to interrupt the current 
    • a resistor 
    • a light bulb which works when the current flows through it 
    • connected in a simple loop 

    • parallel circuits:
    • the electrical current flows in two or more closed paths simultaneously 
    • two branches of circuit are independent 
    • if one component fails, the rest do not work 
    • as components are added, the resistance in the circuit increases and the current through the circuit is reduced 
    • as components are added, more energy is drawn from the power supply
  6. Define and calculate power, voltage differences, current, and resistance in simple circuits
    • voltage:
    • current: the sum of the current in each loop of a multi-loop circuit must add up to the total