ELECTRIC DOOR CHASE

Rules

• Do the activity in presentation mode
• To select the electrical door of your choice, click on the letter shown on the door
• To return to the home page click on the home button at the left corner of the slide

​

Electric door chase is an activity designed to learn the topic Current electricity for class IX students

Pick an Electric Door

I

V

R

ρ

σ

Rules

Electric Current

I

• Intensity of current is the quantity of charge flows through a conductor in one second

I = Q/t I=Current,Q= Charge,

t= time

​

• Unit of current is Ampere (A)
• The device used to measure current in a circuit

Ammeter

Y

Potential Difference

V

• Potential difference is the work done to bring a unit positive charge from one point to another.
• The unit of potential difference is Volt (V)
• The device used to measure Potential difference is Voltmeter

​

Resistance

R

• Resistance is a measure of the opposition to current flow in an electrical circuit.

R = V/I R=resistance,V=voltage,

I= current

• The unit of resistance is ohm Ω
• Resistors are the conductors used to include partculr resistance in a circuit
• Rheostat is the device used to regulate current in a circuit by changing resistance gradually

​

Resistivity

ρ

• Resistivity of a substance is the resistance of the conductor of unit length and unit area of cross section

ρ = R*A/l R= Resistance of conductor

A= Area of cross section

l = length of conductor

• Unit of resistivity is Ωm

​

​

Conductivity

σ

• Conductivity of a conductor is the reciprocal of its resistivity

σ = 1/ρ σ = conductivity

ρ = Resistivity

• Unit of conductivity is Ω^-1 m^-1

​