Question

Eight 7.0W Christmas tree lights are strung in series to a 110 V light source. What is the resistance of each bulb?

Answer 1

Resistance = 1728.57 Ohms

Step-by-step explanation:

Given the following data;

Power = 7 Watts

Voltage = 110 Volts

To find the resistance of each bulb;

Mathematically, power can be calculated using the formula;

`Power = \frac {Voltage^(2)}{resistance}`

Making resistance the subject of formula, we have;

`Resistance = \frac {Voltage^(2)}{power}`

Substituting into the formula, we have;

`Resistance = \frac {110^(2)}{7}`

`Resistance = \frac {12100}{7}`

Resistance = 1728.57 Ohms