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A 9.2 A, 330 V energy meter on full load 0.9 power factor test makes 228 revolutions in 406 seconds. If the normal disc speed is 520 revolutions per kWh. find a)actual energy b) true energy C) error d) percentage error

A 9.2 A, 330 V energy meter on full load 0.9 power factor test makes 228 revolutions in 406 seconds. If the normal disc speed is 520 revolutions per kWh. find a)actual energy b) true energy C) error d) percentage error

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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A 9.2 A, 330 V energy meter on full load 0.9 power factor test makes 228 revolutions in 406 seconds. If the normal disc speed is 520 revolutions per kWh. find a)actual energy b) true energy С) error d) percentage error Actual Energy True Energy Error % error
Transcribed Image Text:A 9.2 A, 330 V energy meter on full load 0.9 power factor test makes 228 revolutions in 406 seconds. If the normal disc speed is 520 revolutions per kWh. find a)actual energy b) true energy С) error d) percentage error Actual Energy True Energy Error % error
Expert Solution
Step 1

Given

Current I=9.2 A

Voltage V=330 V

Power factor cosϕ=0.9

Time t=406 s

Meter constant KT=520 revolutions/kWh

Time in an hour is

t=4063600=0.1127 h

 

Step 2

(a) The actual energy is,

A=VI=9.2×330=3036 VA

(b) The true energy is,

P=VIcosϕ=9.2×330×0.9=2732.4 W

(c) The energy is given by

E=P×t=2732.4×0.1127=307.94 Wh=0.30794 kWh

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