Electrical Principles and Safety Quiz

In parallel wiring, what happens if one device fails?

• All devices stop working
• Only the failed device stops working
• The voltage to other devices decreases
• The current to other devices increases

Which of the following is NOT a benefit of parallel wiring?

• All appliances get full mains voltage
• Devices work independently
• Energy consumption is reduced
• One device failing doesn't affect others

What is the primary risk associated with damaged wire insulation?

• Fire hazard
• Shock risk
• Reduced efficiency
• Overheating

How do damp conditions affect electrical safety?

• Increase conductivity
• Reduce insulation effectiveness
• Improve grounding
• Decrease voltage

In a potential divider, how is voltage shared between resistors?

• Equally
• Randomly
• In proportion to their resistance
• Inversely to their resistance

What does the formula V1 = V × (R1/(R1 + R2)) represent in a potential divider?

• Total voltage
• Current through R1
• Voltage across R1
• Resistance of R1

In a potential divider, which resistor gets the larger share of voltage?

• The smaller resistance
• The larger resistance
• They always get equal voltage
• It depends on the current

What is a potentiometer?

• A fixed resistor
• A variable capacitor
• A variable voltage divider
• An ammeter

How does a potentiometer achieve variable voltage output?

• By changing the supply voltage
• Using a sliding contact on resistive wire
• By adding more resistors
• By increasing the current

In a potentiometer, when is the output voltage at its maximum?

• When the slider is at the ground end
• When the slider is at the supply end
• When the slider is in the middle
• The output is always constant