Units

Question 1

1. What is voltage?
2. What is the symbol for voltage?
3. What is the unit of voltage?

Answer 1

1. Difference in potential, emf
2. V
3. Volts (V)

Question 2

1. What’s current?
2. What’s the symbol for current?
3. What the unit of current?

Answer 2

1. Flow of charges
2. I
3. Amperes or Amps (A) = coulombs per second

Question 3

1. What are charges?
2. What’s the symbol for charges?
3. What’s the unit of charges?

Answer 3

1. Fundamental property of matter.
2. Q
3. Coulombs (C)

Question 4

1. What is resistance?
2. What is the symbol for resistance
3. What is the unit of resistance?

Answer 4

1. Opposition to the passage of a current
2. R
3. Ohms (Ω)

Question 5

1. What is capacitance?
2. What’s the symbol for capacitance?
3. What’s the unit of capacitance?

Answer 5

1. Ability of a body to store charges.
2. C
3. Farads (F)

Question 6

What does SI stand for?

Answer 6

International System of Units

Question 7

What are the prefixes of SI units?

Answer 7

Mega (M) 1e^6
kilo (k) 1e^3
centi (c) 1e^-2
milli (m) 1e^-3
micro (μ) 1e^-6
nano (n) 1e^-9
pico (p) 1e^-12
femto (f) 1e^-15
atto (a) 1e^-18

Question 8

What’s an Angstrom?

Answer 8

Non-standard unit, 1e^10-10

Question 9

How many feet in a meter?
How many centimeters in an inch?
How many microns in a milli-inch (mil)?

Answer 9

3. 2808 ft
4. 54 cm
5. 4 μm

Question 10

1. What is inductance?
2. What’s the symbol for inductance?
3. What’s the unit of inductance?

Answer 10

1. Property of an electric conductor or circuit that causes a voltage to be generated by a change in the current.
2. L
3. Henrys (H)