Question
Download Solution PDFAn electric heater is rated at 800 W. If the supply voltage is 200 V. What is the current rating?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
- Resistance: The property of electrical materials and electrical instruments that opposes the flow of current through them is called resistance.
- It is denoted by R. The SI unit of resistance is the ohm (Ω).
- Power: The rate of work done by an electric current is called power. It is denoted by P. The SI unit of power is the watt (W).
Power dissipation is given by:
Power (P) = V I = V2/R = I2 R
Where V is the potential difference across resistance, I is current flowing and R is resistance.
Calculation:
Given: Power (P) = 800 W; Voltage (V) = 200 V; Current (I) = ?
The electric power of an electric heater is given by:
Power (P) = V I
800 = 200 × I
I = 4 A
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