Electrical power AC & DC

The formula for work is ?

• Force x time

• Force x distance

• Force x Newton

• Joule x Newton

The formula for Power is:

• Joules/Seconds

• Seconds x Joules

• Newtons x Distance

• Current x Impedance

One watt (W) equals

• One Newton per second

• One thousand joules per second

• One joule per second

• One joule per metre

One Kilowatt (kW) is

• 100 watts

• 10000 watts

• 1000 watts

• 1,000,000 watts

The reduction of (opposition to) current flow magnetically in a coil is called ?

• capacitance

• resistance

• impedance

• inductance

An electrical component that causes inductance is called a ?

• capacitor

• inductor

• coil

• resistor

Which of the following is not part of the opposition to current flow that makes up the impedance in an AC circuit?

• resistor

• capacitor

• battery

• inductor

What type of component does the following statement describe? "An electrical attraction forms across the small gap between the negatively charged and positively charged conductors and causes a ‘holding force’ on the electrons across the gap".

• capacitor

• inductor

• resistor

• battery

The single type of opposition to the steady current flow in a DC circuit is:

• Back EMF

• Capacitve reactance

• Inductive reactance

• Resistance

In a purely capacitive circuit the alternating voltage ...........

• leads the current by 90 degrees

• lags the voltage by 90 degrees

• leads the voltage by 90 degrees

• lags the current by 90 degrees