Electric Circuits

A circuit has a voltage of 12V and a resistance of 4 ohms. What is the current in the circuit?

In a series circuit with two resistors, $R_1 = 10\Omega$ and $R_2 = 20\Omega$, connected to a 9V battery, what is the current flowing through the circuit?

A copper wire has a resistivity of 1.72 \times 10^{-8} \Omega \cdot m, a length of 10 m, and a cross-sectional area of 1 \times 10^{-6} m^2. What is its resistance?

How is the resistance of an ohmic element determined from its I-V graph?

A 5\Omega resistor has a current of 2A flowing through it. What is the power dissipated by the resistor?

A wire with original length $L$ and area $A$ has its length doubled and its area halved. By what factor does its resistance change?

What is the relationship between voltage ($V$), current ($I$), and resistance ($R$) in a circuit according to Ohm's Law?

Which of the following factors does NOT affect the resistivity of a material?

What is a characteristic of Ohmic materials?

Which of the following is true regarding energy dissipation in resistors?