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Ms. Kammerer.  An electric circuit is a complete path through which charge can flow.  Symbols are used to represent parts of a circuit Source of electrical.

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Presentation on theme: "Ms. Kammerer.  An electric circuit is a complete path through which charge can flow.  Symbols are used to represent parts of a circuit Source of electrical."— Presentation transcript:

1 Ms. Kammerer

2  An electric circuit is a complete path through which charge can flow.  Symbols are used to represent parts of a circuit Source of electrical energy Devices that are run by the electrical energy

3  Switches are places where the circuit can be opened.  If the switch is open, the circuit is not a complete loop, current stops  When the switch is closed, the circuit will resume flow  Direction of current is the direction in which positive charges flow

4  Charge has only one path it can flow.  If one element stops functioning in a series circuit, none of the elements can operate.  What are sources of resistance?

5  An electrical circuit with two or more paths through which charges can flow

6  Power is the rate of doing work  Electric power is the rate at which electrical energy is converted to another form of energy  Unit is watt (W)  Electric Power P(watts) = I (amps) x V (volts)

7  1. A clothes dryer uses about 27 amps of current from a 240-volt line. How much power does it use?  P = I x V = (240V)(27A) = 6500 W  A camcorder has a power rating of 2.3 watts. If the output voltage from its battery is 7.2 volts, what current does it use?  I = P/V = (2.3W)/(7.2V) = 0.32A  A power tool uses about 12 amps of current and has a power rating of 1440 watts. What voltage does the tool require?  V = P/I = (1440 W)/(12 A) = 120 V

8  E = P x t

9  Correct wiring, fuses, circuit breakers, insulation, and grounded plugs help make electrical energy safe to use.  All wires must be able to carry max expected current  “Blowing a fuse”- a wire will melt if too much current passes through it

10  A circuit breaker is a switch that will open when current is too high  Grounding – the transfer of excess charge through a conductor to Earth


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