27. Resistors & DC Circuits

Two resistors are made of the same material, one twice as long as the other. If the current through the shorter resistor is 5 A, what is the current through the longer resistor if they both have the same potential difference and cross-sectional area?

According to Ohm's Law, how many ohms of resistance will allow a current of $1A$ to flow when a voltage of $1V$ is applied across a resistor?

Which of the following is one function of a resistor in a circuit?

According to Ohm's Law, what is the relationship between the current and the voltage across a resistor in a circuit?

In a cylindrical resistor, what is the effect on the resistance if the radius of the vessel is halved, assuming the length and material remain constant? (The resistance $R$ of a cylinder is given by $R=\rho \frac{l}{\pi r^2}$, where $\rho$ is resistivity, $l$ is length, and $r$ is radius.)

Which of the following best describes Ohm's Law?

Which of the following is the SI unit for electrical resistance?

If a resistor has the color bands green, blue, brown, and gold, what is its resistance and tolerance?

A resistor has a current through it of 5 A. If the EMF across the resistor is 10 V, what is the resistance of this resistor?