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If all the appliances are used at once then the current may become too large and the wires will heat up possibly causing a fire if a circuit broker isn't used.
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Water and electricity together pose a safety hazard; electricity may be conducted to the user and also potentially short circuit something.
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If there are many wires it's a trip hazard (this is a very weak answer).
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Exposed heating elements are dangerous to touch in a toaster
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The hard drive on top has a greater surface area exposed to the air.
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The black hard rive onto is a more efficient set up as black radiates heat(to the surroundings) more effectively than black, thus having its surface area more exposed is advantageous.
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When the white is on the bottom it absorbs less heat from the black hard drive, this is good as it has less surface area to dissipate heat.
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The black hard drive on top will absorb the heat better and transfer it to an exposed area were heat can be dissipated more efficiently than the white hard drive as black absorbs heat more effectively.
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Temperature is a linear scale; the graph does't have a constant gradient (its curved
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Something relating to when the temperature is zero the current isn't
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The probe uses the relationship between temperature and resistance/current, the graph is wrong in showing this relationship