Impedance of voltage source, and tank ckt

[fleem]

Can someone please tell me whether the following statements are wrong or right? this is not homework:

1. Voltage sources, like batteries, have a low impedance (ideally zero)

2. A good car battery's impedance (even with alternating current going through the battery) is typically far less than a few ohms.

3. A tank circuit is driven in parallel and resonates in a series loop.

 

[negitron]

1. True.
2. True.
3. False.

 

[oswaler]

1. This statement is generally correct. Voltage sources, such as batteries, are designed to have a very low internal impedance in order to deliver a consistent voltage to the circuit they are powering. However, it is not correct to say that the ideal impedance of a voltage source is zero. In reality, all voltage sources have some internal resistance, although it may be very small.

2. This statement is also generally correct. A car battery is designed to have a low internal impedance, typically less than a few ohms, in order to provide a high current output. This is important for starting the car's engine, which requires a large surge of current.

3. This statement is incorrect. A tank circuit is driven in series and resonates in a parallel loop. In a tank circuit, the inductor and capacitor are connected in series and the circuit is driven by a voltage source. The output voltage is taken across the capacitor, which is in parallel with the inductor. This allows the circuit to resonate at a specific frequency, determined by the values of the inductor and capacitor.