The electric hotplate is designed for a voltage of 120 V. What resistance must be on its coil in order for a current of 5 A to pass through it?
According to Ohm’s law, the current in the coil of an electric hotplate will be directly proportional to the current voltage and inversely proportional to the electrical resistance of the coil.
I = U / R, where I is the current strength (I = 5 A), U is the rated voltage (U = 120 V), R is the resistance (Ohm).
Let us express and calculate the resistance of the electric stove spiral:
R = U / I = 120/5 = 24 ohms.
Answer: The coil resistance of an electric hotplate is 24 ohms.
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