Electric Circuits

Two resistors, one with a resistance of 12 $\Omega$ and the other with a resistance of 6 $\Omega$, are connected in parallel. What is the equivalent resistance of this combination?

A battery has an EMF of 9 V and an internal resistance of 0.5 $\Omega$. If the current flowing through the battery is 1 A, what is the terminal voltage of the battery?

To measure the voltage across a resistor in a circuit, how should a voltmeter be connected?

A battery with an EMF of 12 V and an internal resistance of 1 $\Omega$ is connected to a 5 $\Omega$ resistor. What is the power dissipated in the internal resistance of the battery?

To measure the current flowing through a resistor in a circuit, how should an ammeter be connected?

Two resistors, with resistances of $R_1 = 5 \Omega$ and $R_2 = 10 \Omega$, are connected in series. What is the equivalent resistance of this combination?

A complex circuit contains a series combination of a 3 $\Omega$ resistor and a 6 $\Omega$ resistor, which is then connected in parallel with a 2 $\Omega$ resistor. What is the equivalent resistance of this entire combination?

A battery with an EMF of 6 V is connected to a resistor. The internal resistance of the battery is 0.2 $\Omega$, and the current in the circuit is 2 A. What is the resistance of the external resistor?

A non-ideal ammeter with internal resistance is used to measure the current in a circuit. How does the internal resistance of the ammeter affect the current measurement?