Heena wanted to find out the properties of some materials. She conducted
an experiment with these materials and recorded her findings in the
table.
Material Conducts heat Conducts
electricity
Beaten into
sheets
Hard
Copper ✔ ✔ ✔ ✔
Coal piece ✖ ✖ ✖ ✖
Pencil lead ✖ ✔ ✖ ✖
Aluminium ✔ ✔ ✔ ✔
a) Based on her findings ,what can you conclude about the relationship
between conductor of heat and electricity ?
b) Which property made some of the materials to be used in making boxes?
Answers
Answer:
a) There is no fundamental relationship between heat and electricity. You can make heat by running an electrical current through a resistance, but almost any process involving energy will produce some heat.
Explanation:
Metals and stone are considered good conductors since they can speedily transfer heat, whereas materials like wood, paper, air, and cloth are poor conductors of heat. These conductive properties are rated based on a "coefficient" which is measured relative to silver.
Electricity is the flow of electrons through a conductor. The amount of current (amps) is related to the voltage (volts) pushing the electrons and the degree of resistance to flow (ohms). During their flow around a circuit, electrons can be used to create a number of useful byproducts such as heat and light.
malleability is the property of metals in which it can be beaten into sheets.
Annealed copper (H040) has a minimum hardness of 40HV, a minium tensile strength 200 N/mm2(R200) with fully cold worked copper (H110) having a hardness of 110HV minimum and tensile strength of 360 N/mm² ( R360) minimum.