Circuit operation is straightforward. The current through the sense resistor (RSENSE) creates a voltage across it, which is then imposed across RA by the op amp. The current through RA A is subscript ...

But with our simple transistor circuit, 20 mA will always flow. Well. Sort of. A Matter of Compliance Practical current sources have a certain range of compliance because they can’t provide an ...

Figure 2B shows the full circuit for current flow. Figure 2 The simple circuit of Figure 1 with ground implied (2A) and with the ground current path indicated (2B) Of course, the ICs themselves are ...

In contrast to alternating current, or AC, which, depending on the supply's frequency, switches direction 50 or 60 times per second, the current in DC circuits flows only in one direction.

The current flow is instantaneous in the circuit. It’s just that the water is acting as a variable resistor in the circuit -the thinner the cross-section at one side, the higher the resistance.

When it comes to electrical circuits, there’s a lot to remember and understand. We've got you covered with this Intro to Circuits BBC Bitesize guide.