Technical Basics

Question 1

What is the symbol and unit for frequency? Measured in?

Answer 1

f, Hz, Hertz

Question 2

What is the symbol and unit for voltage? Measured in?

Answer 2

V, V, volts

Question 3

What is the symbol and unit for current? Measured in?

Answer 3

I, A, amps

Question 4

What is the symbol and unit for resistance? Measured in?

Answer 4

R, Ω, ohms

Question 5

What is the symbol and unit for power? Measured in?

Answer 5

P, W, watts

Question 6

What is the symbol and unit for wavelength? Measured in?

Answer 6

λ, metres, m

Question 7

State the meaning, decimal and prefix for MICRO

Answer 7

one-millionth, 0.000001, µ

Question 8

State the meaning, decimal and prefix for MILI

Answer 8

one-thousandth, 0.001, m

Question 9

State the meaning, decimal and prefix for KILO

Answer 9

one thousand, 1000, k

Question 10

State the meaning, decimal and prefix for MEGA

Answer 10

one million 1,000,000 M

Question 11

State the meaning, decimal and prefix for GIGA

Answer 11

one thousand million 1,000,000,000 G

Question 12

What is a primary battery?

Answer 12

A “Primary” battery is non-rechargeable. Once discharged, the used battery should be properly disposed of.

Question 13

What is a secondary battery?

Answer 13

A “Secondary” battery is rechargeable - it has a reversible chemical process.

Question 14

Power is calculated by multiplying the _____ by ______

Answer 14

P = V x I

Question 15

State Ohms Law

Answer 15

I = V/R , The resistor’s current I in amps (A) is equal to the resistor’s voltage V in volts (V) divided by the resistance R in ohms (Ω). Also: V = I x R and R = V/I

Question 16

UK mains voltage frequency =

Answer 16

50Hz

Question 17

Frequency range for normal human hearing =

Answer 17

20Hz to 15kHz

Question 18

Frequencies for audio communication (e.g. speech) =

Answer 18

300Hz to 3kHz