ELECTRICITY

Units

100

What is the SI unit of power?

Watt

200

State whether true or false. the unit of VI is same as I² R 

True

300

what is the SI unit of heat energy?

KWh or kilo watt hours

400

The unit of voltage is  same as that of?

Work done

Inventors and discoverers

100

Who invented electric bulb?

Thomas Alva Edison

200

Who discovered heating effect of current?

Joule

300

The unit of current is named after whom?

Andre Marie Ampere

400

Who discovered electricity?

Nikola tesla

Formulae

100

What is the equation of ohm's law?

V=IR

200

What is the formula for effective resistance (of two resistors)in parallel?

R_ef = R₁R₂/ (R₁  + R₂ )

300

Is VQ a correct formula for energy?

yes

400

State the formula for resistivity

RA/l

Conceptual

100

Resistivity depends on?

Material

200

For given resistors in series and parallel circuit , which circuit has more current?

Parallel circuit

300

What is the cause of resistance?

Collisions between electrons and molecules

400

Ohm's law doesn't work at?

Different temperatures and materials

Numerical

100

Effective resistance of 6 ohm and two 12 ohm resistors in parallel is?

3 ohms

200

What is the amount of current flowing in a circuit of power 20 Watt and resistance 20 ohms

1 Ampere

300

What is the amount of charge flowing through the wire of resistance 20 ohms and potential difference of 5V for 20 seconds?

2kC

400

In a parallel circuit, there are two resistors 15 ohms and 30 ohms with battery of 5V. Find current flowing through 30 ohms resistor.

1/6 Amperes