Define insulator and conductor. Write 3 examples of each. Bell ringer 2-22-2017 Define insulator and conductor. Write 3 examples of each.

Standards and Objectives GLE.0607.12.1 Describe how simple circuits are associated with the transfer of electrical energy. Identify how simple circuits are associated with the transfer of electrical energy when heat, light, sound, and chemical changes are produced.

ELECTRICAL CIRCUITS

The CELL The cell stores chemical energy and transfers it to electrical energy when a circuit is connected. When two or more cells are connected together we call this a Battery. The cells chemical energy is used up pushing a current round a circuit.

A SIMPLE ELECTRICAL CIRCUIT GLOBE Watch what happens when I click on the light switch to open and close the circuit. WIRE BATTERY SWITCH Show Teacher Guide Hide Teacher Guide

Current: the actual “substance” that is flowing through the wires of the circuit (electrons!)

simple circuits Here is a simple electric circuit. It has a cell, a lamp and a switch. wires cell lamp switch To make the circuit, these components are connected together with metal connecting wires.

simple circuits When the switch is closed, the lamp lights up. This is because there is a continuous path of metal for the electric current to flow around. If there were any breaks in the circuit, the current could not flow.

circuit diagram Scientists usually draw electric circuits using symbols; cell lamp switch wires

COMMON ELECTRICAL SYMBOLS BATTERY x1 BATTERIES x2 BATTERIES x3 GLOBE WIRE SWITCH CLOSED (ON) SWITCH OPEN (OFF) WIRES CROSSING BUT NOT CONNECTED

Simple Circuits Series circuit Parallel circuit All in a row 1 path for electricity 1 light goes out and the circuit is broken Parallel circuit Many paths for electricity 1 light goes out and the others stay on

SERIES PARALLEL DIFFERENCES BETWEEN SERIES & PARALLEL CIRCUITS If one globe burns out or is removed, all globes will stop working. If one globe burns out or is removed, all other globes will continue working. DIFFERENCES BETWEEN SERIES & PARALLEL CIRCUITS The voltage is shared between each globe, resulting in reduced brightness. Each globe receives the full voltage of the source, resulting in all globes burning at the same brightness regardless of the number of globes. Serial circuits are cheap and easy to construct. Parallel circuits require more effort to construct.

How do currents travel? Alternating Current-Travels in two directions. Example- A house Direct Current-Travels in one direction. Example- A battery

Summarizer Number your composition book from 1-4. Make sure to leave plenty of space to write your answers.

The voltage decreases because the current is decreased The circuit is no longer complete, therefore current can not flow The voltage decreases because the current is decreased and the resistance increases.

The current remains the same The current remains the same. The total resistance drops in a parallel circuit as more bulbs are added The current increases.