Virtual Labs

a: P = 3VI cos ⁡ϕ b: P = √I cos ⁡ϕ c: P = √3VI cos ⁡ϕ d: P = √2VI cos⁡ ϕ

a: One of the wattmeters will read zero b: One of the wattmeter connections will have to be reversed c: Both give the same readings d: Pressure coil of the wattmeter will become ineffective.

a: AC power only b: DC power only c: AC or DC power d: AC power of single-phase circuits

a: Go quickly to 100 ohms and remain there b: Show low resistance momentarily and back off to a very high resistance c: Not move at all d: Show very high resistance first and then low

a: True b: False

Three Phase Power Measurement Using Two Wattmeter Method.