Download Aptitude Crack
img not found img not found

Resistance and Power - Technical MCQs

Q1:

How much energy is stored if 6.24 x 1018 electrons are stored in 4 volts?

A 4 joules

B 1.56 x 1018 electrons

C 1.56 coulombs

D 2.496 x 1019 electrons

ANS:A - 4 joules

V = Joules/Coulomb.

thus, Joules = Volts * Coulomb.

Convert 6.24x10^18 electrons to coulomb.
1 electron = 1.60x10^-19 coulomb.
1 coulomb = 6.24x10^18 electrons.

Joules = 4(1) = 4J.