Michigan Test for Teacher Certification (MTTC) Secondary Integrated Science Practice test

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According to Ohm's Law, what is the formula to determine current?

  1. Current = Voltage x Resistance

  2. Current = Voltage / Resistance

  3. Current = Resistance / Voltage

  4. Current = Resistance x Voltage

The correct answer is: Current = Voltage / Resistance

Ohm's Law is a fundamental principle in electrical engineering and physics that defines the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit. The correct formulation of Ohm's Law states that current is directly proportional to voltage and inversely proportional to resistance. This relationship is expressed mathematically by the formula: Current = Voltage / Resistance This means that if you know the voltage applied across a resistor and the resistance, you can find the current flowing through the circuit by dividing the voltage by the resistance. Thus, this option accurately reflects the proper application of Ohm's Law in calculating electrical current. Understanding this formula is crucial because it allows for the calculation of current in various scenarios, helping in circuit analysis and design. The other options misrepresent the relationship outlined by Ohm's Law and do not accurately convey how to determine current based on the voltage and resistance in a circuit.

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