AIM: How does a circuit work?DO NOW:Calculate the current

produced by a 9volt battery through a resistance of 56.5 ohms?

Show your work

CIRCUITA complete path through

which electricity can flow

PARTS OF A CIRCUIT1. Source of energy (battery)

2. Load or device uses electrical energy (light bulb, motor…)

3. Wires connect source to load

4. Switch opens or closes circuit

WHEN CHOOSING Parts of a circuit

YOU should consider if the material is a:

is a material that current can pass

through easily, like metals.

is a material that resists, but doesn’t

stop the flow of current.

is a material that current cannot pass through

easily, like plastic

Circuit diagramCircuit diagram

Energy soucre

switchLoad wires

Scientists usually draw

electric circuits using symbols.

CLOSED CIRCUIT•No breaks

•Electricity can flow

OPEN CIRCUIT•Path is broken

•No electricity flows

Electric current flows when a switch is in the closed, or on, position. When the switch is open, the current will not flow.

When the switch is closed, the 2 pieces of conducting material touch, which allows the electric charges to flow through the circuit.

When the switch is open, the gap between the 2 pieces of conducting material prevents the electric charges from flowing through the circuit.

Don’t ForgetFormula Quiz Jan.

19th

Mid term Jan 26th

AIM: How does a circuit work?

DO NOW: Draw and label the parts of the circuit below & explain why the light is not lit

2 TYPES OF CIRCUITS

1. Series Circuit•All parts connected•1 path (loop)

•1 part broken charge won’t flow

Example: Old holiday lights

2. Parallel Circuit When 2 or more paths (loops) are used for current

•Break in 1 branch, electricity can still flow in others

Example: Home circuits

•Lights in our homes are wired in parallel circuits.

Date # Assignment

Mon 1/10 24 •Textbook page 418 #1-13

Tues 1/11 25 •Textbook page 420-421 #1-9

Wed 1/12 26 •Magnetism worksheet # 1-14

Thurs 1/13

27 •Electromagnetism worksheet

Fri 1/14 28 •Castle Learning assignment

AIM: Why do we measure electricity?

DO NOW:1.Calculate the current

produced by a 20 volt battery through a resistance of 16.3 ohms? Show your work

2.Draw and label the parts of the circuit to the right and identify the type.

An overloaded circuit or a frayed wire can cause a fire.

FUSE• Thin strip of metal• Emergency switch used for

safety• Must be replaced

When the current becomes to high, part of the fuse melts & breaks the flow of electricity.

CIRCUIT BREAKER•Reusable device •Protects circuits from being overloaded & causing fire

Circuit breakers prevent overloaded circuits.

When the strip of metal gets too hot (too much current), it bends due to thermal expansion. This causes the switch to flip which creates an open circuit, and stops the current. It may be switched back on to allow the current to flow once again.