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General Revision (Current and Circuit systems and circuit devices (image,…
General Revision
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Resistance and V=IR
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Example: A 4.0 Ω resistor in a circuit has a potential difference of 6.0V across it. What is the current through the resistor?
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Specific Heat capacity = the heat required to raise the temperature of the unit mass of a given substance by a given amount (usually one degree).
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- More energy to be transferred to the thermal energy store of some materials to increase their temperature than others. E.g you need 4200J to warm up 1KG of water by 1oc, but only 139J to warm 1KG of mercury by 1oc
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Answer: m = 0.2kg SHC = 900J/ kg/oc △ o = change in temp = 30oc △e = m x SCH x △ x Change in temp △e = 2.0 x 900 x 30 △e = 54000J
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