Applied Physics Quiz

What is the unit of electric current?

• Ohm

• Watt

• Ampere

• Coulomb

In a simple DC circuit, if the resistance is doubled while keeping the voltage constant, what happens to the current?

• It remains the same

• It doubles

• It is halved

• It becomes zero

What is the formula for Ohm's Law?

• V=IR

• V=I/R

• I=VR

• R=VI

The total resistance in a series circuit is:

• The sum of the individual resistances

• The product of the individual resistance

• The reciprocal of the sum of the reciprocals

• None of the above

In a parallel circuit, if one resistor is removed, the total resistance:

• Increases

• Decreases

• Remains the same

• Becomes zero

What is the equivalent resistance of two resistors, 4 Ω and 6 Ω, connected in parallel?

• 2.4 Ω

• 10 Ω

• 12 Ω

• 24 Ω

A 12 V battery is connected in a circuit with a 6 Ω resistor. What is the current flowing through the circuit?

• 1 A

• 2 A

• 3 A

• 4 A

In a series circuit, the voltage across each resistor depends on:

• The current

• The total resistance

• The resistance of each resistor

• All of the above

A 100 W light bulb is connected to a 220 V DC supply. What is the current flowing through the light bulb?

• 0.45 A

• 1.5 A

• 2.25 A

• 4.4 A

The total power supplied by a DC source is the product of:

• Current and resistance

• Voltage and current

• Voltage and resistance

• Current squared and resistance