Define resistance. What is the unit of resistance?
Describe an experiment to demonstrate the heating effect of an electric current.
Electrical conduction in differ... show full transcript
Worked Solution & Example Answer:Define resistance - Leaving Cert Physics - Question c - 2015
Step 1
Define resistance. What is the unit of resistance?
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Answer
Resistance is defined as the opposition to the flow of electric current in a conductor. It is determined by the material's properties and its dimensions. The unit of resistance is the ohm (Ω), which is defined as the resistance that allows a current of one ampere to flow when a voltage of one volt is applied across it. Mathematically, resistance (R) can be represented by the equation:
R=IV
where V is the voltage across the conductor and I is the current flowing through it.
Step 2
Describe an experiment to demonstrate the heating effect of an electric current.
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Answer
To demonstrate the heating effect of an electric current, the following experiment can be conducted:
Apparatus:
Battery
Resistance wire (such as a nichrome wire)
Electric heater or hairdryer
Switch
Procedure:
Connect the battery, resistance wire, and electric heater in series with a switch.
Ensure all connections are secure and the circuit is complete.
Close the switch to allow current to flow through the circuit.
Observation/Conclusion:
The resistance wire will become hot due to the electric current flowing through it, demonstrating the heating effect of the electric current.
Step 3
State the charge carriers that are responsible for conduction in each of the following.
(i) gases
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Answer
In gases, the charge carriers responsible for conduction are ions.
Step 4
State the charge carriers that are responsible for conduction in each of the following.
(ii) semiconductors
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Answer
In semiconductors, the charge carriers are electrons and holes.
Step 5
State the charge carriers that are responsible for conduction in each of the following.
(iii) metals
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Answer
In metals, the charge carriers are electrons.
Step 6
State the charge carriers that are responsible for conduction in each of the following.
(iv) solutions
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Answer
In solutions, the charge carriers are ions.
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