Loop rule

Definition

The loop rule states that the sum of the potential differences around any closed loop in a circuit must equal zero. This is based on the conservation of energy.

5 Must Know Facts For Your Next Test

1. The loop rule is also known as Kirchhoff's Voltage Law (KVL).
2. It can be mathematically expressed as $$\sum V = 0$$ for any closed circuit loop.
3. The loop rule applies to both simple and complex circuits with multiple loops.
4. Potential differences include voltage drops across resistors, batteries, and other components in the loop.
5. To apply the loop rule, assign a direction to the current and follow that direction while summing potential differences.

Review Questions

Related terms

Kirchhoff's Current Law (KCL): States that the total current entering a junction equals the total current leaving the junction.

Ohm's Law:

Defines the relationship between voltage, current, and resistance: $$V = IR$$.

Electric Potential Difference:

The work needed to move a charge from one point to another in an electric field; measured in volts.