The power dissipated in a resistor can be written as

Explanation:

The power dissipated in a resistor is given by the equation:

where

P is the power

I is the current

R is the resistance

We can also rewrite the equation by using Ohm's law:

where V is the potential difference across the resistor. Rewriting R as

The equation for the power becomes

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000

0.11 m/s and 0.28 m/s should be correct