Lesson Notes By Weeks and Term v4 - SHS 1
Energy Efficiency and Conservation
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Energy Efficiency and Conservation
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
Subject: Engineering
Class: SHS 1
Term: 2nd Term
Week: 5
Grade code: 1.2.3.LI.4
Strand code: 2
Sub-strand code: 3
Content standard code: 1.2.3.CS.1
Indicator code: 1.2.3.LI.4
Theme: Ene rgy Systems
Subtheme: Energy Efficiency and Conservation
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Good day, future engineers! Have you ever looked at the back of your television, phone charger, or standing fan and seen a small sticker with lots of numbers and symbols? That is called a nameplate. It's like the birth certificate for an electrical appliance, telling us exactly how it uses electricity. In Ghana, we all know how important it is to manage our electricity, whether it's to save money on our ECG (Electricity Company of Ghana) bills or to help reduce the load on the national grid.
This lesson is built around understanding a few key ideas. Let's break them down carefully. A. What is an Appliance Nameplate?
A nameplate is a label or plate attached to a piece of equipment that provides technical specifications about the device. For electrical appliances, it tells us how the device interacts with the electrical supply.
*Example of a Fan Nameplate:* > NASCO Standing Fan - Model: SF-123 > Voltage: 220-240V ~ 50Hz > Power: 60W > Current: 0.27A B. Decoding the Information on a Nameplate
Let's understand the most common terms: Voltage (V): Measured in Volts (V). This represents the electrical 'pressure' the appliance needs to operate correctly. In Ghana, the standard household voltage is about 230V. You must always match the appliance's voltage requirement to the supply. Current (I): Measured in Amperes (A) or "Amps". This is the amount of electrical 'flow' the appliance draws from the socket when it is running. Think of it as how much electricity the device "drinks" per second. Frequency (Hz): Measured in Hertz (Hz). This describes the cycle of the alternating current (AC). In Ghana, our standard frequency is 50Hz. Most appliances are built for this standard. Power (P): Measured in Watts (W) or Kilowatts (kW). This is the rate at which the appliance uses energy. It tells you how much energy is being used *every second* the appliance is on. A higher Wattage means the appliance consumes energy faster. Important Conversion: 1000 Watts = 1 Kilowatt (1000 W = 1 kW) C. The Difference Between Power and Energy