In a voltaic cell, electrons flow from the (positive/negative) to the (positive/negative) terminal.
2 answers:
Explanation :
Voltaic cells are an electro chemical cell in which chemical reactions occurs to produce electrical energy. Its parts are :
(i) At anode oxidation occurs.
(ii) At cathode reduction occurs.
(iii) A salt bridge.
(iv) External circuit.
(v) Load.
Suppose a voltaic cell is made up of and
. Here zinc can lose electron more rapidly as that of copper. Oxidation of zinc occurs and is called as anode. So, this is a negative terminal.
On the other hand, copper receives electron and hence become cathode. So, this is a positive terminal.
Hence, electrons flow form Zinc to copper i.e. from negative terminal to positive terminal.
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Answer:
0.237 (23.7 %)
Explanation:
The thermal efficiency of an engine is given by:
where
W is the useful work output of the engine
is the heat in input
Here we have:
and the work done is the total heat in input minus the heat exhausted:
So, the efficiency is
(23.7 %)