Podcast
Questions and Answers
What is the SI unit of resistance?
What is the SI unit of resistance?
- Ohms (correct)
- Amps
- Watts
- Joules
How is the heat produced in a conductor related to the current flowing through it?
How is the heat produced in a conductor related to the current flowing through it?
- Directly proportional to the current
- Proportional to the square of the current (correct)
- Inversely proportional to the current
- Unrelated to the current
What does a variable resistor allow you to do?
What does a variable resistor allow you to do?
- Change the current flow
- Change the voltage
- Increase power consumption
- Vary the resistance (correct)
In a series circuit, what can be said about the current along the wire?
In a series circuit, what can be said about the current along the wire?
What happens to the current at junctions in parallel parts of a circuit?
What happens to the current at junctions in parallel parts of a circuit?
According to Ohm's Law, what is the relationship between current, potential difference, and resistance?
According to Ohm's Law, what is the relationship between current, potential difference, and resistance?
Which relationship best describes how temperature affects the resistance of metallic conductors?
Which relationship best describes how temperature affects the resistance of metallic conductors?
What is the formula for calculating resistance in series circuits?
What is the formula for calculating resistance in series circuits?
What is the main purpose of a Wheatstone bridge?
What is the main purpose of a Wheatstone bridge?
What is the formula for resistivity ($\rho$) in terms of resistance ($R$), cross-sectional area ($A$), and length ($l$) of a body?
What is the formula for resistivity ($\rho$) in terms of resistance ($R$), cross-sectional area ($A$), and length ($l$) of a body?
In a parallel circuit, how are resistances connected?
In a parallel circuit, how are resistances connected?
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