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An electric heater draws a current of 4 A from a 240 V supply. What is the resistance of the heater?
60 ohms
960 ohms
0.016 ohms
120 ohms
60 ohms
The resistance of an electrical appliance is determined using Ohm's Law, which states that resistance is equal to the voltage divided by the current. By substituting the given values of voltage (240┬аV) and current (4┬аA), the resistance is calculated to be 60┬а╬й.
The resistance of an electrical appliance is determined using Ohm's Law, which states that resistance is equal to the voltage divided by the current. By substituting the given values of voltage (240┬аV) and current (4┬аA), the resistance is calculated to be 60┬а╬й.
Think of voltage as water pressure, current as the rate of water flow, and resistance as the narrowness of the pipe; a higher resistance means a narrower pipe that restricts flow for a given pressure.
V=I├ЧR тАФ Ohm's Law relating voltage, current, and resistance
R=IVтАЛ тАФ Formula to calculate resistance from voltage and current
Ohm's Law governs the linear relationship between voltage, current, and resistance in an electrical circuit at a constant temperature. When a potential difference (V) is applied across a conductor, it drives a current (I) through it, and the opposition offered to this flow is the resistance (R). The formula rearranges to R=IVтАЛ to find the resistance directly.
Ohm's law applies to linear conductors under constant physical conditions like temperature.
The SI unit of electrical resistance is the ohm (╬й).
Resistance is directly proportional to voltage and inversely proportional to current.
Calculating component values in electrical circuits
Designing heating elements with specific power and resistance ratings
Standard unit: The ohm is named after the German physicist Georg Ohm.
Option B (960┬а╬й) is incorrectly obtained by multiplying voltage and current (240├Ч4), while other incorrect options stem from wrong arithmetic configurations.
A is correct тАФ The resistance of the electric heater is calculated using Ohm's Law as R=4┬аA240┬аVтАЛ=60┬а╬й.
For RRB and railway exams, always double-check whether you need to multiply or divide when using Ohm's Law formulas (V=IR, I=V/R, R=V/I) to avoid inverse calculation errors.
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