write assignment in Biology from 1000 words
Construct in your booklet, a table to compare and contrast the characteristics of AC and DC circuits, and their uses.
This provides evidence for P4
In a section on Electric Shock, briefly introduce the dangers of working with electricity, then describe the importance (if any) of the following on the effects of an electric shock (approx 2 pages):
• Voltage, Current, Body Resistance, Time and other external factors, Difference between Direct Current (DC) and Alternating Current (AC).
• In your descriptions for the above, include reference to the effects of an electric shock on the skin, muscles, nerves, heart and brain
• Use data and diagrams to help your explanations.
This provides evidence for P5
For the section on Electrical Safety Practices, explain how the following safety operating features work in circuits. Including how they are activated, how they protect the user and circuit, and a labelled diagram of each device. (approx 2 pages)
• RCCBs (Residual Current Circuit Breakers), also known as RCD’s (Residual Current Detectors)
• ELCBs (Earth Leakage Circuit Breakers)
List 5 wiring/installation precautions which would be important in a laboratory/workshop/factory to ensure electrical safety with a brief description (20-40 words) on why it improves safety.
This provides evidence for M3
Evaluate the effectiveness of safety devices and procedures in each of the following cases. For each example (approx 1 page):
• Identify the risks of use
• Give at least 2 ways in which the risk of receiving a shock is already reduced and one way it already reduces another electrical hazard of your choice.
• Suggest at least 2 improvements that could be made to make use even safer
The examples are:
• Using a bladed power tool eg jigsaw, lawnmower
• Electric immersion heated water bath
• Running an electric tram in a city centre
This provides evidence for D3
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