Calculations in C-R & L-R Circuits Quiz

What is the time constant formula for a CR circuit?

• τ = RC
• τ = L/R
• τ = R/L
• τ = 1/(RC)

What does a capacitor store energy as?

• Magnetic field
• Electrostatic field
• Gravitational field
• Kinetic energy

In an LR circuit, what does the inductor resist?

• Voltage change
• Current change
• Temperature change
• Power change

What is the final steady state value of the current in an LR circuit with a 18V supply, 6Ω resistance and 50mH inductance?

• 1A
• 0.5A
• 3A

• 5A

What is the time constant of an LR circuit with an inductance of 100mH and a resistance of 5Ω?

• 0.06s
• 0.2s

• 0.02s

• 5s

What is the unit of capacitance?

• Ohm
• Farad
• Henry
• Volt

What is the unit of inductance?

• Ohm
• Farad
• Henry
• Volt

What is the product of resistance and capacitance in a CR circuit called?

• Time constant
• Power factor
• Impedance
• Reactance

What does an inductor in an LR circuit create to oppose current flow?

• Electric field
• Magnetic field
• Heat
• Light

What is the voltage across a capacitor 6 seconds after being charged with a 12V supply and a time constant of 15s?

• 0V
• 2.97V

• 3.95V

• 9V