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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:
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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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