Podcast
Questions and Answers
What are the minimum requirements to cause the flow of current?
What are the minimum requirements to cause the flow of current?
- A voltage source, a conductor and an insulator
- A voltage source and a conductor (correct)
- A voltage source, an ammeter, a conductor
- A voltage source, a switch and a resistor
Out of the following, select the best conductor of electricity.
Out of the following, select the best conductor of electricity.
- None of these
- China clay
- Graphite (correct)
- Porcelain
Which of the following statements is correct?
Which of the following statements is correct?
- The resistance of a conductor is the hindrance by which the conductor opposes the flow of the current. (correct)
- The resistance of a wire does not depend upon its material.
- The resistance does not play an important role in electrical engineering.
- The resistance of most of the materials is independent of the temperature.
Resistance of a conductor increases when:
Resistance of a conductor increases when:
The specific resistance ρ depends upon:
The specific resistance ρ depends upon:
The specific resistance ρ is defined as:
The specific resistance ρ is defined as:
The resistance of a conductor, when its temperature is increased:
The resistance of a conductor, when its temperature is increased:
It was experimentally found by James Prescott Joule that the heat produced in a current carrying conductor is proportional to:
It was experimentally found by James Prescott Joule that the heat produced in a current carrying conductor is proportional to:
The value of Joule’s mechanical equivalent of heat, J, is equal to:
The value of Joule’s mechanical equivalent of heat, J, is equal to:
Temperature coefficient of a conductor is defined as the:
Temperature coefficient of a conductor is defined as the:
When current flows in a conductor, heat is produced because:
When current flows in a conductor, heat is produced because:
Heating effect of current has undesirable side effects in:
Heating effect of current has undesirable side effects in:
The resistance of carbon (filament in carbon-filament lamps) when its temperature is decreased:
The resistance of carbon (filament in carbon-filament lamps) when its temperature is decreased:
The curve representing Ohm’s law is:
The curve representing Ohm’s law is:
The condition in Ohm’s law is that:
The condition in Ohm’s law is that:
Ohm’s law does not apply to:
Ohm’s law does not apply to:
Ohm’s law is applicable to:
Ohm’s law is applicable to:
Study Notes
Current Electricity
- To cause the flow of current you need a voltage source and a conductor.
- Graphite is the best conductor of electricity out of the options given.
- Resistance is the opposition to the flow of current within a conductor.
- The resistance of a conductor increases when its length increases and decreases when its area increases.
- Specific resistance (ρ) depends only on the material of the conductor.
- Specific resistance (ρ) is defined as the resistance of a conductor that has a length of 1 m and a cross-section of 1 cm2 at 20oC.
- When the temperature of a conductor is increased its resistance increases.
- James Prescott Joule found that the heat produced in a current carrying conductor is proportional to the square of the current.
- Joule’s Mechanical Equivalent of Heat (J) is 4.2 Joules per calorie.
- Temperature coefficient of a conductor is defined as the increase in resistance per degree Celsius.
- Heat is produced when current flows in a conductor due to collisions between electrons and atoms.
- The undesirable side effect of the heating effect of current is the loss of energy.
- The resistance of carbon (filament in carbon-filament lamps) decreases when its temperature decreases.
- The graph representing Ohm’s law is a straight line.
- The condition for Ohm’s law is that the temperature remains constant.
- Ohm’s law does not apply to semiconductors.
- Ohm’s law applies to conductors in a constant temperature environment.
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Description
This quiz covers essential concepts of current electricity including the role of voltage sources, conductors, resistance, and specific resistance. It also explores the effects of temperature on conductivity and Joule's findings regarding heat production in conductors. Test your understanding of these foundational principles of electricity!
