Electrical Conductors and Metals

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What is voltage a measure of between two bodies with different potential?

The average of the potentials

The sum of the potentials

The difference in potential (correct)

The product of the potentials

If one of the bodies has zero charge, how can the other body relate to it in terms of potential?

Zero potential

Positive or negative potential (correct)

Only positive potential

Only negative potential

What is the voltage difference between two bodies called?

EMF ratio

Potential contrast

Voltage ratio

Potential difference (PD) (correct)

How does doubling the resistance affect the current in a circuit with steady EMF?

Halves the current Signup and view all the answers

How is resistance related to the length and cross-sectional area of a conductor?

Directly proportional to length and inversely proportional to cross-sectional area Signup and view all the answers

What is the unit of electrical resistance?

Ohm (Ω) Signup and view all the answers

What makes carbon the most suitable material for a rubbing connection with commutators or slip rings in generators and alternators?

Its self-lubricating quality Signup and view all the answers

Why is carbon the only non-metal solid that has significance as a conductor?

It possesses self-lubricating quality Signup and view all the answers

What are the ions created when current is passed through some liquids?

Atoms with more electrons than protons Signup and view all the answers

What moves in opposite directions when current is passed through a liquid?

Negatively charged ions and positively charged ions Signup and view all the answers

Why is carbon suitable for rubbing connections despite having a resistance 2000–3000 times that of copper?

It possesses self-lubricating quality Signup and view all the answers

Which metal is the best conductor of electricity?

Silver Signup and view all the answers

What is the descending order of conductivity for the metals mentioned?

Silver, copper, gold, aluminium, brass, carbon Signup and view all the answers

What is commonly used as a baseline to compare the resistance of other conducting materials?

Copper Signup and view all the answers

Why are silver and gold used only in special applications?

Because they are better conductors than other metals Signup and view all the answers

Which metal is commonly used as a conductor in electrical cables?

Copper Signup and view all the answers

Why are steel, aluminium, and other metals used as conducting mediums in aircraft and automobile structures and engines?

Because they are part of the assemblies manufactured for some other primary purpose Signup and view all the answers

What does the symbol 'R' represent in the context of electrical fundamentals?

Resistance Signup and view all the answers

What factors control the resistance of an object like a wire conductor?

Material, length, cross-sectional area, temperature Signup and view all the answers

What is the reciprocal of resistance called?

Conductance Signup and view all the answers

How does the resistance of most materials change with temperature?

It increases as the temperature increases Signup and view all the answers

Which unit is used to measure conductance?

Siemens Signup and view all the answers

What is the term for liquids that are able to conduct ionically?

Electrolytes Signup and view all the answers

Which type of solution exhibits weak conductivity according to the provided table?

Weak acids Signup and view all the answers

What happens when electricity is passed through an ionic solution?

Ions become free to move around in the water Signup and view all the answers

Which type of compound conducts electricity poorly according to the table?

Molecular compounds (sugar solution) Signup and view all the answers

What is the result of placing positive and negative electrodes in an electrolyte?

Positive and negative ions are attracted to the opposite-polarity electrodes Signup and view all the answers

What allows ions to carry electric current in an ionic solution?

Their ability to move freely Signup and view all the answers