Electric Circuits

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# Electric Circuits - PowerPoint PPT Presentation

Electric Circuits. Electric Circuits. When a wire is connected to the terminals of a source, a complete path called a CIRCUIT is formed An electric circuit provides a complete, closed path for an electric current. Parts of a Circuit. Voltage/energy Source Wires/conductors Closed circuit

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## PowerPoint Slideshow about 'Electric Circuits' - amable

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Presentation Transcript

### Electric Circuits

Electric Circuits
• When a wire is connected to the terminals of a source, a complete path called a CIRCUIT is formed
• An electric circuit provides a complete, closed path for an electric current
Parts of a Circuit
• Voltage/energy Source
• Wires/conductors
• Closed circuit

May also include:

• Resistors
• Switches

BATTERY/

VOLTAGE

SOURCE

SWITCH

RESISTOR

Circuit Diagrams (schematics)
Series Circuits
• There is only one path for the electrons to take
• If one part of the circuit opens, the whole circuit goes out.

RTotal= R1 + R2 + R3 + …

• Current is the same everywhere in the circuit.

I = V / RT

• Voltage drop across each resistor device is current x resistance. V (drop) = I x R
• Voltage thru battery is sum of voltage drops in circuit. VT = V1 + V2 + V3…
Rules for solving series circuits

2 ohms

3 volts

6 V

3 ohms

4 ohms

Parallel Circuits
• There are separate branches to the circuit
• If there is a break in a parallel circuit, electrons can still move through the other branches

Separate conductive paths for each bulb /resistor connected to the voltage source

• Any break in a branch, current stops in THAT branch ONLY. Current continues in the other branches.
Parallel Circuits

1/RTotal = 1/R1 + 1/R2 + 1/R3 + …

• Total Voltage = voltage across each branch
• Vtotal = V1 = V2 = V3 …
• I total = I1 + I2 + I3… (sum of I in all branches)
Rules for solving Parallel circuits

3 volts

2 ohms

6 V

3 ohms

4 ohms

2 ohms

2 ohms

2 ohms

Pop goes the Fuse!!
• Fuses protect against too much current flowing at once
• Inside each fuse is a small strip of metal
FUSES
• If the current becomes too high, the strip of metal melts and breaks the flow of electricity

When a fuse is blown, a small piece of metal melts if the current becomes too high.

• This causes a break in the circuit, thus stopping the flow of current through the overloaded circuit.
• Circuit breakers have a piece of metal that bends instead of melting and can be reset by changing it back to the on position.
Fuses:

Series:

• The current has only one loop to flow through.
• Flashlights and some holiday lights
• Amount of current is the same everywhere.
• When any part of a series circuit is disconnected, no current flows through the circuit (open circuit).
• Parallel:
• Contain two or more branches for current to move through.
• The current splits up to flow through the different branches.
• Voltage difference is the same in each branch.
• More current flows through the branches with lower resistance
Electric Circuits: