Electricity and Circuits

Electricity and Circuits

Electric Circuit

• The closed path along which electric current flows is called an electric circuit.

• The electric circuit has various elements such as the cell, bulb and switch.

• These elements are connected togeher through wires.

Multiple Choice

What is a circuit?

• an outlet or switch

• a path in which an electric current flows

• a poor conductor

Multiple Choice

What would happen if the switch was opened?

• nothing, the light bulbs would still work because there is a complete path
• The light bulbs would not work because the path was broken
• the battery would loose energy
• the wires would be cooled from air

Multiple Choice

this circuit is .....?

• open
• parallel
• closed
• The cutest little circuit evah!

Multiple Choice

When a circuit is open, the circuit is _________?

• On

• Off

Multiple Choice

A PATH along which electricity can flow is a ___________________?

• light bulb

• switch

• insulator

• circuit

Multiple Choice

The device used to open and close circuits is called a ______.

• circuit

• wire

• switch

• open circuit

Multiple Choice

What is a switch?

• part of the toaster that you plug into the wall

• an outlet that gives power

• part of a circuit that starts or stops the electricity

Multiple Choice

What is an electric current? 

• the flow of electricity 
• electricity moving in only one direction
• a switch that gives power

• Electric Bulb

  An electric bulb is a device which produces light when electricity is passed through its terminals.

  The two terminals do not directly touch each other to avoid short circuit.

  
  

• The bulb has two thick contact wires in the center with a thin wire attached between them. This thin wire is called filament.

• One of the thick wires is connected to the metal case at the base of the bulb and the other is connected to the metal tip at the center of the base. These two form the terminals.

• When electricity is passed through the terminals of the bulb, the filament gets heated up and produces light.

• A bulb is said to be fused if the filament gets broken. Fused bulb doesn’t glow.

Conductors

• Conductor is defined as materials that allow electricity to flow through them easily. This property of conductors that allow them to conduct electricity is known as conductivity.

• Examples of conductor Graphite, the human body, and the earth are good conductors of electricity.

• Some of the common conductor examples include metals such as:

  Copper Gold Iron

Insulators

• An electrical conductor is defined as materials that allow electricity to flow through them easily.

• A few examples of an insulator are paper, wood, and rubber.

Multiple Choice

What is the direction of current in an electric circuit?

• Positive to negative

• Negative to positive

• None of these

Multiple Choice

Which of the following is the symbol of an electric bulb?

Multiple Choice

Rita connected two bulbs across two cells in a simple circuit. What should she do to make the bulbs glow dimmer?

• Replace one cell with a piece of chalk

• Replace one cell with a piece of wire

• Replace one bulb with a piece of wire

• Replace one bulb with another cell

Multiple Choice

Why is tungsten used as a filament in electric bulbs?

• It is non-luminous

• It is a soft metal

• It has a high melting point

• It has a low melting point

Multiple Choice

A bulb has-

• Two terminals and one filament

• Two terminals and two filaments

• Multiple terminals and single filament

• Single terminal and Single filament

Multiple Select

Which of the following are insulators? (Select all that apply.)

• Plastic

• Tungsten

• Paper

• Styrofoam

• Rubber

Multiple Choice

Filament of a bulb is made up of-

• Aluminium

• Chromium

• Platinum

• Tungsten

Multiple Select

Which of the following are conductors? (Select all that apply.)

• Graphite

• Wood

• Lead

• Iron

• Glass

Multiple Choice

A material which allows the electricity to pass through it is __

• Conductor

• Insulator

• Transistor

• None of these

Multiple Choice

A material which does not allow the electricity to pass through it is _____

• Conductor

• Electric cell

• Insulator

• None of these

Torch

• Electric torch is an electronic device which is used to artificially produce light .

• The working procedure of an electric torch is :

  1) When we click the "ON" switch of the torch then the electricity flows from the battery chamber to the terminals of the bulb which is connected with that torch.

• 2) When the bulb gets enough amount of electricity ,the filament or the diode part of that bulb ,starts glowing and produces light.

  In this way electricity is converted into light energy in the electric torches.