Question

The resistance of a 24 W, 12 V filament lamp depends on the current flowing through the lamp. For currents up to 0.8 A, the resistance has a constant value of 2.5. Calculate the voltage across the lamp when a current of 0.8 A flows through the lamp.

Answer 1

The voltage across the lamp when a current of 0.8 A flows through it is 2.0 volts, calculated using Ohm's law (V = IR), with V representing voltage, I the current, and R the resistance.

Step-by-step explanation:

To calculate the voltage across a lamp when a current of 0.8 A flows through it, we can use Ohm's law which is V = IR, where V is the voltage, I is the current, and R is the resistance. Given that the resistance of the lamp is 2.5 Ω (ohms) when a current of up to 0.8 A flows, we simply plug in the values into the formula.

Using the formula V = IR,

V = 0.8 A × 2.5 Ω

V = 2.0 V

Therefore, the voltage across the lamp when a current of 0.8 A flows through it is 2.0 volts.