Fundamentals

Question 1

What is Electricity?

Answer 1

A cumulative flow of electrons (and charge carriers) in a
particular direction consistently, is electricity!

Question 2

An electron has a charge of?

Answer 2

−𝟏. 𝟔𝟎𝟐𝟐 × 𝟏𝟎
−𝟏𝟗 𝑪 (coulomb)

Question 3

How can we push
electrons to create current?

Answer 3

We do so by creating a potential
difference between two points, or voltage
(between two points)

Question 4

What is Ohm’s Law?

Answer 4

V = IR

Question 5

Kirchoffs Current Law

Answer 5

Kirchhoff’s Current Law
Algebraic sum of current entering a node is
zero.
𝐼1 + 𝐼3 + 𝐼4 = 𝐼2 + 𝐼5

Question 6

Kirchoff’s Voltage Law

Answer 6

Algebraic sum of voltages around a closed
loop is zero

𝑽𝟏 − 𝑽𝟐 + 𝑽𝟑 = 0

Question 7

What is Energy and whats the formula?

Answer 7

Energy consumed translates to Work done.
E = V x I x T

Question 8

Watt is Power, and whats the formula?

Answer 8

Power is Work done per unit time

P = VxI = V^2/R = I^2R = E/T

Question 9

What is an Inductor?

Answer 9

A coil of wire wound around a magnetic core like iron

Question 10

Formula for Voltage (Inductor)

Answer 10

V = L x dl/dt

Question 11

Magnetic Field in Inductor?

Answer 11

Current in the coil (aided by the magnetic core)
creates a magnetic field and hence magnetic flux
Changing the magnetic flux in the coil induces a
voltage that prevents the flux change

Question 12

What is a Capacitor?

Answer 12

Two parallel plates with insulation (dielectric) in
between

Question 13

Current Equation (Capacitor)

Answer 13

I = C x dV/dt

Question 14

Energy Stored in Capacitors?

Answer 14

Energy stored using electrostatic attraction: + and –
charges in adjacent plates attract each other

Question 15

How does inductor oppose sudden changes in current?

Answer 15

By inducing as much voltage is
theoretically needed to keep the
current steady.

Question 16

How does Capacitor oppose sudden changes in voltage?

Answer 16

By generating as much current
is theoretically needed to keep
the voltage steady