Question

unit 6 - physical science - mrs. pearson
name & #:
date: 12/4
period:
appliance name | 42 inch led tv | 42 inch plasma tv | air conditioner | air fryer | amazon echo | apple tv | chromebook | clothes dryer | curling iron | dehumidifier | dishwasher | electric stove | fridge-freezer | game console | hair dryer
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
power consumption (w) | 60 | 500 | 3000 | 1500 | 3 | 5 | 45 | 3000 | 30 | 450 | 1500 | 2000 | 60 | 200 | 2200
power consumption (kw) | | | 3kw | .15 | | | .045 | .3 | | | | .2kw | | .02 |
daily schedule (hr) | | | 12 | | 1 | | 2.0m | 3.5m | | | | 2 | 12 | 4 |
quantity | | | | | 1 | | 1 | 1 | | | | 1 | | 1 |
energy consumption (kwh) | | | | | | | | | | | | | | |
cost rate = $0.13 per kwh | | | | | | | | | | | | | | |

Explanation:

To calculate energy consumption (kWh) for an appliance, we use the formula: \( \text{Energy (kWh)} = \text{Power (kW)} \times \text{Daily Schedule (hr)} \times \text{Quantity} \). Let's take the 42 Inch LED TV as an example (Power = 60 W = 0.06 kW, Daily Schedule =?, Quantity = 1). Wait, maybe a better example: Air conditioner (Power = 3000 W = 3 kW, Daily Schedule = 12 hr, Quantity = 1).

Step1: Convert Power to kW

For Air conditioner: \( 3000 \, \text{W} = \frac{3000}{1000} = 3 \, \text{kW} \)

Step2: Apply Energy Formula

\( \text{Energy} = 3 \, \text{kW} \times 12 \, \text{hr} \times 1 = 36 \, \text{kWh} \)
(If we take Game console: Power = 200 W = 0.2 kW, Daily Schedule = 4 hr, Quantity = 1. Then \( 0.2 \times 4 \times 1 = 0.8 \, \text{kWh} \))

Answer:

The energy consumption formula is \( \boldsymbol{\text{Energy (kWh)} = \text{Power (kW)} \times \text{Time (hr)} \times \text{Quantity}} \), and for example, Air conditioner (3 kW, 12 hr, 1) uses 36 kWh.