11 Questions
What is the SI unit of resistance?
Ohms
How is the heat produced in a conductor related to the current flowing through it?
Proportional to the square of the current
What does a variable resistor allow you to do?
Vary the resistance
In a series circuit, what can be said about the current along the wire?
It remains the same at every point
What happens to the current at junctions in parallel parts of a circuit?
It remains the same at each junction
According to Ohm's Law, what is the relationship between current, potential difference, and resistance?
Current is directly proportional to potential difference and inversely proportional to resistance
Which relationship best describes how temperature affects the resistance of metallic conductors?
As temperature increases, resistance increases due to increased impedance
What is the formula for calculating resistance in series circuits?
$R_T = R_1 + R_2$
What is the main purpose of a Wheatstone bridge?
To measure the resistance of an unknown resistor
What is the formula for resistivity ($\rho$) in terms of resistance ($R$), cross-sectional area ($A$), and length ($l$) of a body?
$\rho = RA / l$
In a parallel circuit, how are resistances connected?
$1/R_T = 1/R_1 * 1/R_2$
Learn about the rules for currents and voltages in circuits, including the relationships in parallel and series circuits. Explore how resistance adds up in series and in parallel configurations. Understand the function of potentiometers in circuit analysis.
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