A capacitor that is initially uncharged is connected in series with a resistor and an emf source with E = 120 V and negligible internal resistance. Just after the circuit is completed, the current through the resistor is 6.7×10−5 A . The time constant for the circuit is 4.4 s .'What are the resistance of the resistor and the capacitance of the capacitor?

Resistance = 1.791 x 10^(6) Ω

Capacitance = 2.46 x 10^(-6) F

Explanation:

We are given;

EMF; E = 120V

Current; I = 6.7 × 10^(−5) A

Time constant; τ = 4.4 s

Now, just after the circuit is completed, the capacitor acts like a wire and thus we use the loop rule;

So,

E - IR = 0

Let's make the resistance R the subject.

R = E/I = 120/(6.7 × 10^(−5)) = 1.791 x 10^(6) Ω

Now formula for time constant is given as;

τ = RC

Where C is capacitance.

Thus, C = τ/R = 4.4/(1.791 x 10^(6))

C = 2.46 x 10^(-6) F

nec chapter 5 contains

c. information on special occupancy areas

nec chapter 6 covers

a. special equipment

which of the following rules contain the words shall or shall not and must be adhered to?

b. mandatory rules

which of the following rules identify actions that are allowed but not required and typically cover options or alternative methods?

c. optional rules

which of the following serves as the introduction to the nec and provides an overview of the book?

a. nec article 90

organizations that test products for safety are

c. nrtls

the nec is published by the

a national fire protection association

the nec is divided into

b. 9 chapters

the nec provides informative annexes for

c. informational materials and examples

two terms from nec article 100 that trainees should become familiar with are

b. labeled and listed

explanation: