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Safely using AC in Electronics

Safely using AC in Electronics. What do I need to do?. Things to ensure your safety…. Always have dry hands. Always make sure the cord or wires are free of rips and tears. Look for touching parts to prevent shorts. Get the teacher to check your board before plugging it into a power source. .

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Safely using AC in Electronics

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  1. Safely using AC in Electronics What do I need to do?

  2. Things to ensure your safety… • Always have dry hands. • Always make sure the cord or wires are free of rips and tears. • Look for touching parts to prevent shorts. • Get the teacher to check your board before plugging it into a power source.

  3. Continued… • Double check your parts for the correct values. • Uncoil the power cord and reduce the amount of folding or knotting in the wire. • Always work on your project unplugged.

  4. What is DC?

  5. History of DC • 1887 direct current (DC) was king. • 121 Edison power stations scattered across the United States delivering DC electricity • DC had limitations -- power plants could only send DC electricity about a mile before the electricity began to lose voltage.

  6. Continued… • George Westinghouse introduced high-voltage (AC), which could carry electricity hundreds of miles with little loss of voltage. • Edison created the electric chair to demonstrate how dangerous AC is.

  7. What is DC? • DC electricity is the continuous movement of electrons from (−) to (+). • DC electricity in a circuit consists of voltage, current and resistance. • The flow of DC electricity is similar to the flow of water through a hose. • http://www.school-for-champions.com/science/dc.htm

  8. What does it look like? http://www.pbs.org/wgbh/amex/edison/sfeature/acdc.html

  9. What is Voltage?

  10. What is Voltage? • The voltage between two points is the electrical driving force. • How much electricity is moving through 2 points. • Measured in Volts.

  11. What is Current? • It’s the flow of electricity through a conductor. • How fast is it moving? • AC and DC • Measured in Amps.

  12. What is Resistance? • The ability of a substance to prevent or resist the flow of electrical current. • Slowing of current • A substance resists electrical current because of a collision between electrons and atoms, which slows the electrons down and converts some of their energy to heat energy.

  13. Continued… • Resistors are insulators. • Measured in Ω.

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