An electric heater supplied at 40 Volt's draws a current of 5 ampere. If it is now connected to a 120 Volt supply, find the value of current being drawn ?
R = E/I = 40/5 = 8 Ohms.
I = E/R = 120/8 = 15A.
To find the value of current being drawn when the electric heater is connected to a 120 Volt supply, we can use Ohm's Law. Ohm's Law states that the current (I) in a circuit is equal to the voltage (V) divided by the resistance (R). In this case, the resistance of the heater remains constant.
Let's assume the resistance of the heater is R.
1. First, let's find the resistance (R) of the heater using the original voltage and current values:
V = 40 Volts
I = 5 Amperes
According to Ohm's Law, we have:
R = V / I
= 40 / 5
= 8 Ohms
So, the original resistance of the heater is 8 Ohms.
2. Now, when the heater is connected to a 120 Volt supply, we need to find the new current (I').
Using Ohm's Law again, we have:
V' = 120 Volts (new voltage)
I' = ? (new current)
R = 8 Ohms (the resistance we found earlier)
Rearranging Ohm's Law, we get:
I' = V' / R
= 120 / 8
= 15 Amps
Therefore, when the electric heater is connected to a 120 Volt supply, the value of current being drawn is 15 Amperes.