Electrical complex numbers

How is a series resistor of 2 Ω, a capacitive reactance of 3 Ω and an inductive reactance of 5 Ω be represented?

• (2 + j2) Ω

• (2 - j2) Ω

• (2 + j8) Ω

• 10 Ω

What does (20∠-60°) Ω represent?

• a capacitor

• a capacitor and resistor

• an inductor and resistor

• an inductor and resistor

An impedance expressed as (6 + j8) represents:

• a resistor and a capacitor in series

• a capacitor and an inductor in series

• a resistor and a capacitor in parallel

• an inductor and a resistor in series

The impedance of a capacitor and a resistor in parallel could be expressed as:

• 10 ∠-40^∘ Ω

• 10 ∠+40^∘ Ω

• (j2 - 1) Ω

• -j2 Ω

A circuit contains 3 components: an inductive reactance of 8 Ω, a resistance of 3 Ω and a capacitive reactance of 3 Ω. Select the overall impedance:

• (3 - j5) Ω

• (j5 + 3) Ω

• 14 Ω

• j5 Ω

Select the correct statement regarding a voltage of (30 ∠20^∘) V supplying a current of (2 ∠-30^∘) A :

• the current lags the voltage by 30^∘

• the current leads the voltage by 30^∘

• the current lags the voltage by 50^∘

• the voltage leads the current by 20^∘

An impedance of (5 - j3) Ω represents:

• a series resistor and inductor

• a series capacitor and resistor

• a series capacitor and inductor

• a parallel resistor and inductor

What does an impedance expressed as (10∠30°) represent?

• a resistor and capacitor

• a capacitor and inductor

• an inductor

• a resistor and inductor

How is a series resistor of 5 Ω, a capacitive reactance of 7 Ω and an inductive reactance of 3 Ω represented?

• (5 + j4) Ω

• (4 - j5) Ω

• (2 + j8) Ω

• (5 - j4) Ω

What resistance does (20∠-60°) Ω contain?

• 20 Ω

• 17.32 Ω

• 10 Ω

• 37.32 Ω