#1
What is the unit of electrical resistance?
Ohm
ExplanationMeasure of opposition to current flow.
#2
What is the SI unit of electric charge?
Coulomb
ExplanationMeasure of charge quantity.
#3
In a DC circuit, what does Kirchhoff's voltage law state?
Voltage across a closed loop is zero
ExplanationSum of voltages in a closed loop is zero.
#4
What is the purpose of a diode in an electrical circuit?
To control the flow of current
ExplanationAllows current flow in one direction.
#5
What is the purpose of a transformer in an electrical system?
To change voltage levels
ExplanationStep-up or step-down voltage conversion.
#6
What is the relationship between power, voltage, and current in an electrical circuit according to the power equation?
P = VI
ExplanationMathematical expression of electrical power.
#7
What does the term 'ground' (earth) refer to in an electrical system?
A low-resistance path for electric current
ExplanationReference point with zero voltage.
#8
Which law states that the current through a conductor between two points is directly proportional to the voltage across the two points?
Ohm's Law
ExplanationRelationship between voltage, current, and resistance.
#9
What is the function of a capacitor in an electronic circuit?
To store electrical energy
ExplanationStores and releases electrical energy.
#10
What is the primary function of a circuit breaker in an electrical system?
To protect against overcurrent
ExplanationInterrupts circuit during overcurrent.
#11
What is the relationship between frequency and wavelength in an electromagnetic wave?
Inversely proportional
ExplanationAs one increases, the other decreases.
#12
What is the function of a Zener diode in a circuit?
To regulate voltage
ExplanationMaintains stable voltage across load.