Download Electricity Electric Circuits

Electricity
Electric Circuits
• 13.1 Electric Circuits
• 13.2 Current and Voltage
• 13.3 Resistance and Ohm's Law
13A Investigation: Electricity
Key Questions:
What is electricity?
How is electricity measured
and described?
What is a circuit?
13A Investigation Topics
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Identify conductors and insulators.
Measure voltage in a battery.
Measure current in a circuit.
Draw circuit diagrams.
Investigate how a dimmer switch works.
Chapter 13.1 Objectives and Vocabulary
• Explain how electrical
energy is supplied to
devices in a circuit.
• Use electrical symbols to
draw simple circuit
diagrams.
• Distinguish between
open and closed circuits.
• electric current
• electric circuit
• circuit diagram
• electrical symbols
• resistor
• closed circuit
• open circuit
• switch
Chapter 13.2 Objectives and Vocabulary
• List the units used to
measure current and
voltage.
• ampere
• Describe how to measure
current and voltage in a
circuit.
• Explain the function of a
battery in a circuit.
• voltmeter
• multimeter
• voltage
• volt
• battery
• ammeter
13B Investigation: Resistance and Ohm's
Law
Key Questions:
What is the relationship
between current, voltage
and resistance?
How does a potentiometer
work?
What is voltage drop and what
does it tell you about where
the electrical energy carried
by the current is going?
13B Investigation Topics
• Measure resistance in a circuit.
• Use Ohm's law to identify the mystery
resistor in a circuit.
• Investigate how a potentiometer
works.
• Investigate the relationship between
voltage drop across the potentiometer
and voltage drop across the bulb in a
circuit.
Chapter 13.3 Objectives and Vocabulary
• Explain the
relationships between
current, voltage and
resistance.
• Use Ohm's law to
calculate current,
resistance, or voltage.
• Distinguish between
conductors and
insulators.
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resistance
ohm
Ohm's law
conductor
insulator
semiconductor
potentiometer
Do We Understand Simple
Series Circuits?
Problem #1
A circuit is made of a 48 v battery and three
resistors connected in series. R1 has a
resistance of 2 Ω, R2 has a resistance of 4 Ω,
and R3 has a resistance of 6 Ω.
A) Draw the circuit diagram.
B) Find the total resistance.
C) Find the circuit current.
D) Find V1, V2, and V3.
• Problem #2
• A circuit is made of a 60 volt battery and
three resistors connected in series. R1 has
a resistance of 5 Ω, R2 has a resistance of
10 Ω, and R3 has a resistance of 15 Ω.
• A) Draw the circuit diagram.
• B) Find the total resistance.
• C) Find the circuit current.
• D) Find V1, V2, and V3.