Question 1 of 15
What is the unit of electrical resistance?
The ohm (?) is the standard unit for measuring electrical resistance.
Question 2 of 15
Who discovered Ohm's Law?
Georg Simon Ohm formulated the relationship between voltage, current, and resistance.
Question 3 of 15
What is the formula for calculating resistance (R) using voltage (V) and current (I)?
Ohm's Law states that resistance is equal to voltage divided by current.
Question 4 of 15
If a circuit has a voltage of 12V and a current of 2A, what is the resistance?
R = V/I = 12V / 2A = 6?
Question 5 of 15
What happens to current in a circuit if the resistance increases (assuming voltage remains constant)?
According to Ohm's Law, current and resistance are inversely proportional when voltage is constant.
Question 6 of 15
What tool is used to measure electrical resistance?
An ohmmeter is specifically designed to measure resistance.
Question 7 of 15
What is the resistance of a conductor that allows 1 Ampere to flow with 1 Volt applied?
By definition, 1 Ohm allows 1 Ampere with 1 Volt applied.
Question 8 of 15
How is resistance affected by the material of a conductor?
Different materials inherently have different abilities to conduct electricity, hence different resistances.
Question 9 of 15
Which of the following is NOT a factor that affects resistance?
The color of the wire doesn't directly affect the resistance.
Question 10 of 15
What is the formula to calculate resistance (R) using power (P) and current (I)?
R = P / I^2 is the formula for calculating resistance using power and current.
Question 11 of 15
If a 60W lightbulb is connected to a 120V source, what is its resistance?
R = V^2 / P = (120^2) / 60 = 240 Ohms
Question 12 of 15
What does the Greek letter omega (?) represent?
The Greek letter omega (?) is the symbol for ohms, the unit of resistance.
Question 13 of 15
In an AC circuit, what is the relationship between impedance (Z), resistance (R), and reactance (X)?
Impedance is the vector sum of resistance and reactance.
Question 14 of 15
How can you calculate resistance in an AC resistive circuit?
In a purely resistive AC circuit, resistance is calculated using the impedance and reactance.
Question 15 of 15
If the power factor is 1, what is the relationship between impedance and resistance?
When the power factor is 1, the circuit is purely resistive and impedance equals resistance.
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