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Physics · Grades 8–11

Current in an ohmic resistor

Assume an ohmic resistor at constant temperature; circuit values are theoretical.

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Rule and assumptions

Assume an ohmic resistor at constant temperature; circuit values are theoretical.

I = V/R

Worked examples

An ohmic resistor of 6 Ω has potential difference 11 V. Find current. This is a paper calculation, not a construction instruction. Round to 3 decimal places if needed. Answer in A.

I = V/R 11 / 6 = 1.833

1.833 A

An ohmic resistor of 31 Ω has potential difference 50 V. Find current. This is a paper calculation, not a construction instruction. Round to 3 decimal places if needed. Answer in A.

I = V/R 50 / 31 = 1.613

1.613 A

Try two questions

  1. An ohmic resistor of 79 Ω has potential difference 26 V. Find current. This is a paper calculation, not a construction instruction. Round to 3 decimal places if needed. Answer in A.

  2. An ohmic resistor of 35 Ω has potential difference 7 V. Find current. This is a paper calculation, not a construction instruction. Round to 3 decimal places if needed. Answer in A.

Answers and reasoning

Answers and marking notes
  1. 0.329 A

    I = V/R 26 / 79 = 0.329

  2. 0.2 A

    I = V/R 7 / 35 = 0.2

Further reading and review references

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Learning preview · independent educational and translation review required. Suggested grades are not official curriculum alignment.