The 'Magic X' for Series Circuits

Struggling with series circuits? What if I told you there's a super easy trick to remember Ohm's Law for them?

Subject: electricity • Classes: 6–12 • Difficulty: basic (6-8)

The Trick

For series circuits, remembering the relationship between Voltage (V), Current (I), and Resistance (R) is easy with the 'Magic X'. Draw a large 'X'. Write 'V' at the top, 'I' on the left, and 'R' on the right. To find any value, cover it up. For example, to find V, it's I multiplied by R (I * R). To find I, it's V divided by R (V / R). To find R, it's V divided by I (V / I). This works because Ohm's Law is $V = IR$. This 'X' visually represents this relationship, making it easier to recall which variable is on which side of the equation.

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