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Series Circuits PowerPoint PPT Presentation

Series Circuits. 8 Note Boxes. A Battery and a Bulb-Simple Circuits. Unsuccessful ways to light a bulb. . A Battery and a Bulb-Simple Circuits. Unsuccessful ways to light a bulb. Successful ways to light a bulb. Electrons Flow…. from the negative part of the battery through the wire

Series Circuits

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Series Circuits

8 Note Boxes

A Battery and a Bulb-Simple Circuits

• Unsuccessful ways to light a bulb.

A Battery and a Bulb-Simple Circuits

• Unsuccessful ways to light a bulb.

• Successful ways to light a bulb.

Electrons Flow…

• from the negative part of the battery through the wire

• to the side (or bottom) of the bulb

• through the filament inside the bulb

• out the bottom (or side)

• through the wire to the positive part of the battery

• The current then passes through the battery to complete the circuit.

• Series Circuits

Box #1-2 notes

• In series circuits, current can only take one path.

• The amount of current is the same at all points in a series circuit.

Series Circuits

Box #2

• The main disadvantage of a series circuit is that when one device fails, the current in the whole circuit stops.

• Some cheap light strings are connected in series.

• When one lamp burns out, you have to replace it or no lights work.

Voltage in a Series Circuit

Box #3-2notes

• Voltage: electrical potential; gives force to move electrons through a circuit

• Voltage is linked to energy; to increase voltage you can use a stronger battery OR add batteries

• More voltage is like a stronger pump

• Giving more force and more current

• To find total voltage, you simply add each individual battery

Voltage-Potential Holders

• Batteries are considered to contain potential energy; often called potential difference

• Batteries give voltage: circuits use voltage

• The voltage at the negative end of the batteries is always zero

Electrical Current

Box #4-3 notes

• Current: moving electrons; how easily electrons can move

• Increasing electricity (voltage)=More current=Brighter lights!

• Current is measured in amps (energy!) C-I-A

Light bulbs, motors, and wires create resistancein a circuit.

Resistance: slows down the current

The longer the wire or the more bulbs/motors, the more the resistance.

Resistance is measured in Ohms

Total resistance in a series circuit

Box #5-4 notes

Box #6

• Adding devices in a circuit increases resistance

• More resistance=less current

• Less current=less light

• Each resistance in a series circuit adds to the total resistance of the circuit.

Box #7

Rtotal = R1 + R2 + R3...

Total resistance

(ohms)

Individual resistances (W)

Ohms’s Law

Box #8

(Amps)

(volts)

(ohms)

Each separate resistance creates a voltage drop as the current passes through.

As current flows along a series circuit, each type of resistor transforms some of the electrical energy into another form of energy

Ohm’s law is used to calculate the voltage drop across each resistor.

Box #6

Objectives

• Recognize and sketch examples of series circuits.

• Calculate the current in a series circuit containing up to three resistances.

• Calculate the total resistance of a circuit by combining series resistances

• Design and construct series circuits