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UNIT FIVE: Electricity and Magnetism

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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  1. UNIT FIVE: Electricity and Magnetism • Chapter 16 Electricity • Chapter 17 Magnetism

  2. 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

  3. 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.

  4. Key Question: How do you measure voltage and current in electric circuits? Investigation 16A Electricity

  5. 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.

  6. 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.

  7. 16.2 Voltage • A difference in voltage provides the energy that causes current to flow.

  8. 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.

  9. 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.

  10. 16.2 Batteries • A pump is like a battery because it brings water from a position of low energy to high energy.

  11. 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).

  12. 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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