Chapter 14, Problem 1R

Based on the total estimated load calculations, what is the current draw on the Study/Bedroom circuit? __________________________________________________________

To determine

Calculate the current drawn on the Study/Bedroom circuit based on the total estimated load calculations.

Answer to Problem 1R

The current draw on the Study/Bedroom circuit based on the total estimated load calculations is 9.4 amperes.

Explanation of Solution

Formula used:

Write the general expression to calculate the VOLT-AMPERES for single-phase.

$\text{VOLT-AMPERES}=\text{E}\times \text{I}$ (1)

Here,

E is the supply voltage, and

I is the current.

Rearrange the equation (1) to find the current I in amperes.

$\text{I}=\frac{\text{VOLT-AMPERES}}{\text{E}}$ (2)

Calculation:

Refer to Table 14-1 in the textbook.

The total estimated load in VA for the Study/Bedroom outlet count in Circuit A21 is 1125 VA.

The single-phase supply voltage (E) is 120 V.

Substitute 1125 VA for VOLT-AMPERES and 120 V for E in equation (2) to find the current I in amperes.

$\begin{array}{c}\text{I}=\frac{1125\text{VA}}{120\text{V}}\\ =9.375\text{A}\\ \cong \text{9}\text{.4}\text{amperes}\end{array}$

Conclusion:

Thus, the current draw on the Study/Bedroom circuit based on the total estimated load calculations is 9.4 amperes.