what is the resistance of a 240v, 60w electric filament bulb? a). 0.25ohms b). 480ohms c). 60ohms d). 240ohms e). 960ohms?
P = E^2/R = 60 W.
240^2/R = 60,
R = 960 ohms.
How do we get the 960
To find the resistance of a filament bulb, we can use Ohm's Law, which states that resistance (R) is equal to voltage (V) divided by current (I). In this case, the voltage is given as 240V and the power is given as 60W.
First, let's calculate the current (I) using the power formula: P = IV, where P is power and V is voltage. Rearranging the formula to solve for current, we have:
I = P / V
I = 60W / 240V
I ≈ 0.25A
Now that we have the current, we can use Ohm's Law to find the resistance. Rearranging the formula R = V / I, we have:
R = 240V / 0.25A
R = 960 ohms
Therefore, the correct answer is e) 960 ohms.
To find the resistance of an electric filament bulb, we need to use Ohm's Law, which states that resistance (R) is equal to the voltage (V) divided by the current (I). However, we are given the voltage (240V) and the power (60W) of the bulb.
To find the resistance, we first need to determine the current flowing through the bulb. Power (P) is equal to the product of current (I) and voltage (V), so we can rearrange the equation to solve for the current:
P = IV
60W = I * 240V
Now we can solve for I (current):
I = 60W / 240V
I = 0.25A
Now that we have the current, we can use Ohm's Law to find the resistance:
R = V / I
R = 240V / 0.25A
R = 960 ohms
Therefore, the correct answer is e) 960 ohms.