Some Electrical Formulas Quiz

According to Ohm's Law, which of the following is the correct relationship between Voltage (V), Current (I), and Resistance (R)?

• V = I + R

• V = I / R

• V = IR

• V = I - R

What is the formula for power (P) in an electrical circuit?

• P = IV

• P = I/R

• P = I + V

• P = I²R

Which formula represents the force (F) on a conductor carrying current (I) in a magnetic field (B) with length (L)?

• F = BIL

• F = B/I

• F = BL/I

• F = B + I + L

How is the efficiency (η) of a device calculated?

• η = (Output/Input) × 100%

• η = (Input/Output) × 100%

• η = Output - Input

• η = Input - Output

What is the relationship between Joules (E) and Watts (P) over time (T)?

• E = P × T

• E = P / T

• E = P + T

• E = P - T

What is the formula for the RMS (Root Mean Square) value?

• RMS Value = 0.7071

• RMS Value = 1.4142

• RMS Value = 2

• RMS Value = 0.5

Which formula is this?

• Resistance

• Resistivity

• Joule's Law

• Rho's Law

Which formula is this?

• Motors

• Generators

• Transformers

• Earth fault loop impedance

What is the periodic time of a frequency of 25Hz?

• 0.4 seconds

• 40 milli seconds

• 2.5 seconds

• 0.25 seconds

If the periodic time is 0.01 seconds, what is the frequency?

• 0.1 Hz
• 200 Hz
• 50 Hz
• 100 Hz