A business uses two 3 kW electrical fires for an average duration of 20 hours per week each, and six 150 W lights for 30 hours per week each. If the cost of electricity is 14 p per unit, determine the weekly cost of electricity to the business.

A business uses two 3 kW electrical fires for an average duration of 20 hours per week each, and six 150 W lights for 30 hours per week each. If the cost of electricity is 14 p per unit, determine the weekly cost of electricity to the business.

EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition

ISBN:9781337516549

Author:Simmons

Publisher:Simmons

Chapter27: Service-entrance Equipment

Section: Chapter Questions

Problem 32R

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Thermistors

A thermistor is a special type of resistor whose resistance is more temperature-dependent than standard resistors. The resistance of the thermistor decreases with increasing temperature. This is the basic principle of thermistors. This allows the thermistor circuit to detect very small temperature changes that cannot be observed with the Resistance temperature detectors (RTDs) or the thermocouples. Since the resistance of a thermistor is temperature dependent, it can be connected to an electrical circuit to measure body temperature. This high sensitivity to temperature changes makes thermistors very useful for accurately controlling and calibrating temperature measurements. In general, resistance increases with increasing temperature in most metals, but thermistors react negatively.

Question

Hi could i please have the workings out and answer for the question attached.

If possible could you write down any formulas used.

Thank you! :)

A business uses two 3 kW electrical fires for an average duration of 20 hours per week each, and six 150 W
lights for 30 hours per week each. If the cost of electricity is 14 p per unit, determine the weekly cost of
electricity to the business.

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