High School

A small brake light powered by an automotive battery of 12.0 V has a power rating of 30 W. What is the resistance of the brake light in ohms? Round your answer to the nearest tenth.

Answer :

5ohms is the resistance of the brake light in ohms.

What are opposition and an example?

Resistance is the degree to which a substance obstructs or opposes an electric current. Electric current is the flow of electrons. To better understand resistance, imagine how difficult it would be for a person to move from one shop to another in a crowded market.

Resistance and formula are what?

The following is the equation to use Ohm's Law to compute resistance: R = V I, where R is the resistor's resistance expressed in ohms () and V is the voltage drop expressed in volts.

POWER(watts) = VOLTAGE * AMPERAGE

AMPERAGE = POWER(watts) / VOLTAGE

AMPERAGE = 30/12 = 2.5

RESISTANCE(ohms) = VOLTAGE / AMPERAGE

R = 12/2.5 = 4.8ohms

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