- 71 Views
- Uploaded on
- Presentation posted in: General

Electric Circuits

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Electric Circuits

Series and Parallel Circuits

- An electric circuit is a complete path through which charge can flow
- Circuit diagrams use symbols to represent parts of a circuit
- Circuit diagrams show a source of electrical energy, and devices run by electrical energy

- A circuit diagram will show one or more paths for the charge to flow
- Switches are where the circuit can be open
- An open circuit occurs if a switch is open then the circuit is not a complete loop and the current stops
- A closed circuit is when the switch is closed and the circuit is complete

- A series circuit has only one path that the charge can flow
- If one element in a series circuit stops working then the whole circuit will not work
- Each bulb in a series circuit adds resistance and makes all of the bulbs dimmer

- A parallel circuit is when two or more paths through which the charge can flow
- If one element stops working then the charge can flow along another path
- This is common in houses

- The rate at which electrical energy is converted to another form of energy is electric power
- The unit is joule per second or watt (W)
- Power is often in kilowatts (kW)
- Power = current x voltage or P = I x V
- P(watts) = I (amps) x V (volts)

- An electric oven is connected to a 240 volt line and it uses 34 amps of current. What is the power used by the oven?
- Current = I = 34 ampsVoltage = V = 240 voltsPower = I x V
- Power = 34 amps x 240 voltsPower = 8160 watts

- There are several things needed to make a house safe such as correct wiring, fuses, circuit breakers, insulation, and grounded plugs
- In the US most houses have an average of 120 volts and each device increases the current
- If too many devices are used it may cause a fire

- A fuse prevents current overload in a circuit
- A wire in the fuse will melt if there is too much current
- This is how we “blow a fuse”
- Most houses now use circuit breakers
- A circuit breaker is a switch that will open when a current is too high