Resistance Physics Example 1

Follow the full solution, then compare it with the other examples linked below.

Example 1

easy
A resistor carries 2 A2 \text{ A} of current when 10 V10 \text{ V} is applied across it. What is the resistance?

Solution

  1. 1
    Use Ohm's law rearranged for resistance: R=VIR = \frac{V}{I}.
  2. 2
    Substitute the values: R=102R = \frac{10}{2}.
  3. 3
    R=5 ΩR = 5 \text{ } \Omega

Answer

R=5 ΩR = 5 \text{ } \Omega
Resistance measures how much a component opposes the flow of current. Higher resistance means less current for the same voltage.

About Resistance

A measure of how strongly a material opposes electric current, measured in ohms (Ω\Omega) — higher resistance means less current for a given voltage.

Learn more about Resistance →

More Resistance Examples

Example 2 medium

A wire has length [formula], cross-sectional area [formula], and resistivity [formula] (copper). Wha

Example 3 easy

If the resistance of a wire doubles and the voltage stays the same, what happens to the current?

Example 4 medium

A wire has resistance [formula]. If you replace a wire with one that is twice as long and has three

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