Unit five electricity and magnetism
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UNIT FIVE: Electricity and Magnetism. Chapter 16 Electricity Chapter 17 Magnetism. Chapter Sixteen: Electricity. 16.1 Charge and Electric Circuits 16.2 Current and Voltage 16.3 Resistance and Ohm’s Law 16.4 Types of Circuits. Chapter 16.2 Learning Goals.

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UNIT FIVE: Electricity and Magnetism

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Unit five electricity and magnetism

UNIT FIVE: Electricity and Magnetism

  • Chapter 16 Electricity

  • Chapter 17 Magnetism


Chapter sixteen electricity

Chapter Sixteen: Electricity

  • 16.1 Charge and Electric Circuits

  • 16.2 Current and Voltage

  • 16.3 Resistance and Ohm’s Law

  • 16.4 Types of Circuits


Chapter 16 2 learning goals

Chapter 16.2 Learning Goals

  • Explain how current flows in an electric circuit.

  • Define voltage and describe how it is measured.

  • Discuss the function of a battery in an electric circuit.


Investigation 16a

Key Question:

How do you measure voltage and current in electric circuits?

Investigation 16A

Electricity


16 2 current and voltage

16.2 Current and voltage

  • Electric current is measured in units called amperes, or amps (A) for short.

  • One amp is a flow of a certain quantity of electricity in one second.

  • The amount of electric current entering a circuit always equals the amount exiting the circuit.


16 2 voltage

16.2 Voltage

  • Voltageis a measure of electric potential energy, just like height is a measure of gravitational potential energy.

  • Voltage is measured in volts(V).

  • A voltage difference of 1 volt means 1 amp of current does 1 joule of work in 1 second.


16 2 voltage1

16.2 Voltage

  • A difference in voltage provides the energy that causes current to flow.


16 2 voltage2

16.2 Voltage

  • A useful meter is a multimeter, which

  • can measure voltage or current, and sometimes resistance.

  • To measure voltage, the meter’s probes are touched to two places in a circuit or across a battery.


16 2 batteries

16.2 Batteries

  • A batteryuses stored chemical energy to create the voltage difference.

  • Three 1.5-volt batteries can be stacked to make a total voltage of 4.5 volts in a flashlight.


16 2 batteries1

16.2 Batteries

  • A pump is like a battery because it brings water from a position of low energy to high energy.


16 2 measuring current

16.2 Measuring current

  • If you want to measure current you must force the current to pass through the meter.

  • Multimeters can measure two types of current: alternating current (AC) and direct current (DC).


16 2 measuring current1

16.2 Measuring current

  • Circuit breakers and fuses are two kinds of devices that protect circuits from too much current by making a break that stops the current.


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