When the resistance in a closed circuit changes, some things happen based on Ohm's Law. Ohm's Law can be written as:

V = IR

Here’s what the letters mean:

• V = Voltage (measured in volts)
• I = Current (measured in amperes)
• R = Resistance (measured in ohms)

Now, let’s break down how changes in resistance affect the circuit:

1. When Resistance Increases:

   • If resistance goes up, the current goes down.
   • For example, with a steady voltage of 10V, if the resistance increases from 5Ω to 10Ω, the current decreases from 2A to 1A.
   • You can find this using the formula: I = V/R.

2. When Resistance Decreases:

   • If resistance goes down, the current goes up.
   • So, if the resistance drops from 10Ω to 5Ω, the current increases from 1A to 2A.

3. Power Use:

   • The way power (P) changes is shown by the formulas: P = IV or P = I²R.
   • Higher resistance usually means the circuit uses less power.

In simple terms, as resistance goes up, current goes down, and that can change how much power the circuit uses.