ELECTRIC CIRCUITS

HOUSE WIRING

How is your house wired?

Can you trace the electrical

connection around your house?

Outside of the house – two wires leading to your house (drop wires) which having a

voltage of 220 volts (V).

These two wires are connected to the electric

meter.

From the meter, the wires go through the main switch.

From the main switch, wires go through the panel board and branch out to the different parts of the house.

In the panel board, fuses or circuit breakers are found.

protect a circuit in event of an overload. 

Circuits branching out from the panel board are: A. lighting circuits – lightning fixtures

of the house

B. power circuits - electrical outlets and sockets

MAIN COMPONENTS OF A HOUSEHOLD CIRCUIT

A. electrical meter B. Main switch C. Panel Board D. Sockets E. Loads (electrical devices

and appliances) F. Connecting wires G. Switches

1. How many power circuits do you have?

2. How many sockets are there in your power

circuit?

3. Do you have enough sockets for your home

appliances?

SIMPLE ELECTRIC CIRCUIT CIRCUIT – any arrangement of materials

that provides a path of electrons to flow.

It is composed of:a. electrical energyb. load (electrical appliances)c. connecting wires

It can be opened or closed by turning the switch.

Circuit diagram

When the switch is open, there is no electric current.

SEATWORK:

IDENTIFY TWO SIMPLE CIRCUITS FOUND IN OUR HOME.

1. What is the charge of an electron?

2. What is the charge of a proton?

3. What is the charge of the neutron?

4. What is the basic unit of electric charge?

Review:

SI UNITS used in electricity: VOLTS (V): unit of potential difference,

emf, or voltage OHM (Ω): unit of resistance AMPS (AMPERES) (A): unit of current COULOMBS (C): unit of charge (= the

charge moved when one amp of current runs for one second).

WATTS (W): unit of power (power energy per unit time). In electrical circuits, one watt is produced when a current of one amp flows down a potential difference of one volt.

JOULE (J): unit of energy.