Electrical Concepts Quiz

What is the SI unit of electric current?

• Volt

• Ampere

• Ohm

• Watt

Which instrument is used to measure current in a circuit?

• Voltmeter

• Ammeter

• Ohmmeter

• Thermometer

In which type of circuit is an ammeter connected?

• In series

• In parallel

• Across the battery

• Across a resistor

What does a potential difference of 3V mean?

• 3 W of power is consumed

• 3 J of work is done per unit charge

• 3 C of charge is transferred

• 3 A of current flows

How is a voltmeter connected in a circuit?

• In series

• In parallel

• At the battery only

• In reverse

Which formula is correct for Ohm's Law?

• V = IR

• R = V X I

• I = V + R

• P = I/R

What happens to the current if resistance increases, assuming voltage stays the same?

• Current increases

• Current decreases

• Current remains unchanged

• Voltage increases

What is the effect of adding more resistors in series?

• Current increases

• Resistance decreases

• Brightness increases

• Resistance increases

In a parallel circuit, what happens when more resistors are added?

• Effective resistance increases

• Bulbs become dimmer

• Current decreases

• Effective resistance decreases

Which component has a symbol representing a variable resistance?

• Light bulb

• Battery

• Rheostat

• Ammeter