Series and parallel circuits：练习题

In a simple series circuit consisting of a cell and two identical lamps, which statement correctly describes the current at different points in the circuit?

Two resistors with resistances of \(4 \Omega\) and \(12 \Omega\) are connected in parallel. What is the effective resistance of this combination?

In the circuit shown, a \(12 \text{ V}\) battery is connected to a \(6 \Omega\) resistor in series with a parallel combination of two \(4 \Omega\) resistors. What is the total current flowing from the battery?

A parallel circuit has two branches connected across a \(12 \text{ V}\) battery. If the potential difference across the first branch is \(12 \text{ V}\), what is the potential difference across the second branch?

In the circuit shown, the ammeter reading is \(2.0 \text{ A}\). If an identical resistor is added in series with the existing resistor, what will be the new reading on the ammeter?

In the circuit shown, the ammeter \( A_1 \) indicates a current of \( 0.4 \text{ A} \). Determine the reading on ammeter \( A_2 \) and explain your reasoning.

Using the values provided in the circuit diagram, calculate the total current \( I \) that flows out of the battery.

Calculate the effective resistance of the arrangement of two resistors connected in parallel as shown in the diagram.