The illumination given out by a lamp is not necessarily the same in all directions. The candlepower of an arc lamp was measured in various directions; it was 250 C.P. directly downwards.; 1070 C.P. at 300 to the vertical. If this lamp is 8 m above the pavement, find the illumination directly under the lamp, and also on a screen at the place on the pavement corresponding to the 300 direction and placed perpendicular to the direction of the light.

The illumination given out by a lamp is not necessarily the same in all directions. The candlepower of an arc lamp was measured in various directions; it was 250 C.P. directly downwards.; 1070 C.P. at 300 to the vertical. If this lamp is 8 m above the pavement, find the illumination directly under the lamp, and also on a screen at the place on the pavement corresponding to the 300 direction and placed perpendicular to the direction of the light.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter18: Resistive-inductive Parallel Circuits

Section: Chapter Questions

Problem 5RQ: How many degrees out of phase are the current and voltage in Question 2?

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