8th Grade Ch. 2 Sec. 4 Electrical Circuits

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8th Grade Ch. 2 Sec. 4 Electrical Circuits

  1. 1. Ch. 2 Sec. 4 Electrical Circuits
  2. 2. Ohm’s Law <ul><li>Resistance= Voltage (volts) </li></ul><ul><ul><ul><li>(ohms) Current (amps) </li></ul></ul></ul><ul><ul><ul><li>R= V V=C X R </li></ul></ul></ul><ul><ul><ul><li>C </li></ul></ul></ul>
  3. 3. Ohm’s Law <ul><li>Resistance= Voltage (volts) </li></ul><ul><ul><ul><li>(ohms) Current (amps) </li></ul></ul></ul><ul><ul><ul><li>Resistance= 10 ohms </li></ul></ul></ul><ul><ul><ul><li>Voltage= 20 volts </li></ul></ul></ul><ul><ul><ul><li>Current= ? </li></ul></ul></ul><ul><ul><ul><li>10= 20 </li></ul></ul></ul><ul><ul><ul><li>C </li></ul></ul></ul><ul><ul><ul><li>Current = 2 amps </li></ul></ul></ul>
  4. 4. Ohm’s Law <ul><li>Resistance= Voltage (volts) </li></ul><ul><ul><ul><li>(ohms) Current (amps) </li></ul></ul></ul><ul><ul><ul><li>Resistance= ? </li></ul></ul></ul><ul><ul><ul><li>Voltage= 60 volts </li></ul></ul></ul><ul><ul><ul><li>Current= 2 amps </li></ul></ul></ul>
  5. 5. Find the missing variable. <ul><li>Resistance= Voltage (volts) </li></ul><ul><ul><ul><li>(ohms) Current (amps) </li></ul></ul></ul>120 volts 4 ohms 80 volts 2 ohms 2 amps 100 volts 25 amps 75 volts Current Voltage Resistance
  6. 6. amp ammeter current Ohm multimeter resistance Volt voltmeter voltage unit measured with
  7. 7. basic features of a circuit: <ul><li>source of electrical energy </li></ul><ul><ul><ul><ul><ul><li>eg. battery </li></ul></ul></ul></ul></ul><ul><li>have device run by electrical energy </li></ul><ul><ul><ul><ul><ul><li>eg. light bulb </li></ul></ul></ul></ul></ul><ul><li>connected by conducting wires & switch = used to open & close circuit </li></ul><ul><li>closed - circuit complete </li></ul><ul><li>open - circuit broken </li></ul>
  8. 8. Electrical Flow [02:04]
  9. 9. resistor <ul><li>uses electrical energy as it interferes w/ flow of charge </li></ul>
  10. 10. Series and Parallel Circuits [00:36] . 2 types of circuits: series & parallel
  11. 11. series circuit only 1 path for current to take advantage disadvantages simple to build if 1 light goes out- all go out more bulbs added- greater resistance
  12. 12. series circuit
  13. 13. Christmas tree lights series circuit
  14. 14. several paths for current to take advantage more branches added- decreased resistance if 1 light goes out- other stay lit
  15. 15. household circuits-parallel circuits
  16. 17. series circuits vs. parallel circuits comparing circuits slideshow
  17. 18. Series and Parallel Circuits [02:02]

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