Download Chapter 15 Lesson 2: Physical Science

Access Prior Knowledge
Lesson 2: What are simple circuits?
Opening Activity
Open Science textbook to page 482.
Open Science folder to review vocabulary words and outline for the chapter.
Open Science journal and answer the following questions:
1- Name some simple machines and how they work.
Review Content Cards and Q-Cards in bin, sharing with partners quizzing each
other quietly.
Log in to clickers using student ID number.
Be ready to review home learning when timer goes off.
Don't forget to write your home
learning in your agenda page
151A.
Do you agree with the statement?
Simple circuits have a source of energy, a conductor, a resistor, and a switch.
YES
NO
Do you agree with the statement?
Even if a circuit is broken, charges will still flow through it.
YES
NO
Do you agree with the statement?
A switch controls the flow of charges.
YES
NO
Do you agree with the statement?
Series circuits can only have one resistor on the same wire.
YES
NO
Parts of a Circuit
A circuit moves electrical energy from one place to another in
a looped path and has a source of energy and a conductor.
A battery can provide the energy to move electric charges
through a circuit and is made of chemicals that can make a
current.
-The current leaves the negative end of the battery and
moves to the positive end of the battery.
A circuit can have more than one conductor and makes an
unbroken path in the circuit.
An insulator keeps the electric charges inside the pathway.
-Charges will not flow in a broken circuit.
A circuit can also have a switch that opens or closes a gap in
the circuit.
-Closing the gap lets the electric charges flow.
-Opening the gap stops the current.
Most circuits also have resistors, which transform energy to
electrical energy into sound, light, thermal, or mechanical
energy.
-A light bulb is a resistor because it changes electrical energy
into light energy.
-A buzzer is another resistor because it
changes electrical energy into sound energy.
Circuit Diagrams
People use circuit diagrams to help build circuits and the lines on a circuit
diagram show how electricity moves through the circuit.
-The symbols on a circuit diagram show different parts of the circuit.
-For example, the symbol for a wire looks like a line and the symbol for a
resistor is an uneven line.
The volt is a measure of the electrical energy a source makes.
Ohms measure the amount of resistance to an electrical current.
The current in the circuit is measured in amperes, also called amps.
-Current is measured by how much charge moves past a certain spot each
second.
Series Circuit
A circuit with more than one resistor in a single loop is called a series circuit.
TextQuest
Answer questions in your Science Journal
1. Name four common parts of a circuit.
2. Describe the purpose of a resistor in a circuit.
3. If the switch is left open, what will happen to the
current?
Don't forget to write your
home learning in your agenda
page 151A.