Units
What is the SI unit of power?
Watt
Who invented electric bulb?
Thomas Alva Edison
What is the equation of ohm's law?
V=IR
Resistivity depends on?
Material
Effective resistance of 6 ohm and two 12 ohm resistors in parallel is?
3 ohms
State whether true or false. the unit of VI is same as I2 R
True
Who discovered heating effect of current?
Joule
What is the formula for effective resistance (of two resistors)in parallel?
Ref = R1R2/ (R1 + R2 )
For given resistors in series and parallel circuit , which circuit has more current?
Parallel circuit
What is the amount of current flowing in a circuit of power 20 Watt and resistance 20 ohms
1 Ampere
what is the SI unit of heat energy?
KWh or kilo watt hours
The unit of current is named after whom?
Andre Marie Ampere
Is VQ a correct formula for energy?
yes
What is the cause of resistance?
Collisions between electrons and molecules
What is the amount of charge flowing through the wire of resistance 20 ohms and potential difference of 5V for 20 seconds?
2kC
The unit of voltage is same as that of?
Work done
Who discovered electricity?
Nikola tesla
State the formula for resistivity
RA/l
Ohm's law doesn't work at?
Different temperatures and materials
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