# 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.

## Presentation on theme: "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."— Presentation transcript:

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

CIRCUIT A complete path through which electricity can flow

PARTS OF A CIRCUIT 1. 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 diagram Energy soucre switch Loadwires 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 Forget Formula Quiz Jan. 19 th Mid term Jan 26 th 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