Quiz on Power Analysis in AC Circuits

What does the power rating of an electrical device indicate?

• The maximum voltage

• The maximum current

• The amount of power required

• The type of circuit

What is instantaneous power defined as?

• The power rating of a device

• The total energy consumed

• The average power over time

• The product of voltage and current at any instant

In a purely resistive circuit, what is the relationship between voltage and current?

• They are in phase

• They are out of phase

• Current leads voltage

• Voltage leads current

What happens to appliances if the power rating is exceeded?

• They become more durable

• They consume less power

• They can be damaged permanently

• They operate more efficiently

What is the average power in watts?

• The power factor

• The maximum power rating

• The average of instantaneous power over one period

• The total power consumed

What is the formula for average power when voltage and current are in phase?

• P = IV

• P = I^2R

• P = IV cos(θ)

• P = V^2/R

What is the effective (RMS) value of a periodic current?

• The average current over time

• The instantaneous current

• The DC current delivering the same average power

• The maximum current

What is apparent power defined as?

• The power factor

• The total power consumed

• The product of RMS voltage and RMS current

• The product of average power and voltage

What does a power factor of 1 indicate?

• Capacitive load

• Inductive load

• Purely resistive load

• Purely reactive load

What is the purpose of power factor correction?

• To improve the power factor

• To decrease the load

• To reduce the current

• To increase the voltage