Bob F Posted February 10, 2009 Report Share Posted February 10, 2009 The force that causes electrons to flow through a conductor is known as: the power. the current. the voltage. the resistance. Quote Link to comment Share on other sites More sharing options...
Bob F Posted February 11, 2009 Author Report Share Posted February 11, 2009 (edited) Well, we have a 60/40 split between Voltage and Current on this one. The correct answer is Voltage. Voltage is electrical pressure, a potential force or difference in electrical charge between two points. It can push electrical current through a wire, but not through its insulation. Voltage is measured in volts (V). One volt can push a certain amount of current. two volts twice as much, and so on. A voltmeter measures the difference in electrical pressure between two points in volts. Current is the actual flow of electrons in a wire. Current flows in a wire pushed by a voltage. Current is measured in Amperes (A), or Amps for short. An ammeter measures current in amps. Resistance opposes the flow of current, so it slows the flow of current. Every electrical component or circuit has resistance. Resistance is measured in ohms. A special meter, called an ohmmeter, can measure the resistance of a device in ohms when no current is flowing. The way I visualize the relationship between voltage, current and resistance is to think of a tank of water with a pipe attached to it, and a tap somewhere along the pipe. The tank of water represents the voltage (potential energy). The higher you lift the tank, the greater its potential energy will be, and therefore faster the water (current) will flow out of the pipe. The tap represents the resistance. The more you close the tap (increase resistance), the slower the water will flow. VOLTAGE IS PRESSURE. CURRENT IS FLOW. RESISTANCE OPPOSES FLOW. BF Edited February 11, 2009 by Bob F Quote Link to comment Share on other sites More sharing options...
Sinbad Posted February 12, 2009 Report Share Posted February 12, 2009 Bob I'm enjoying these. Have you ever thought about a teaching Career ? Serriously... long holidays..... golden 'hello' for the mature candidate.... They must be desparate for Physics teachers.. Quote Link to comment Share on other sites More sharing options...
Bob F Posted February 12, 2009 Author Report Share Posted February 12, 2009 Actually, it might be something I'd consider. It would certainly be a nice change in the pace of life. Not sure how to go about it, though... BF Quote Link to comment Share on other sites More sharing options...
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