Subelement B: Electrical Math— Topic 9: Ohm’s Law-1
Question 3-9B4
Element 3 (GROL)If a 100-ohm resistor is connected across 200 volts, what is the current through the resistor?
Explanation
This question can be solved using Ohm's Law, a fundamental principle in electronics and amateur radio. Ohm's Law states the relationship between voltage (V), current (I), and resistance (R). The formula to calculate current when voltage and resistance are known is:
I = V / R
Where:
* I is current in amperes (A)
* V is voltage in volts (V)
* R is resistance in ohms (Ω)
Given:
* Voltage (V) = 200 volts
* Resistance (R) = 100 ohms
Substituting the values into the formula:
I = 200 V / 100 Ω
I = 2 amperes
Therefore, the current through the resistor is 2 amperes.
Options B, C, and D are incorrect because they do not result from the correct application of Ohm's Law with the given values. For example, 1 ampere (B) would imply a voltage of 100V (1A * 100Ω), not 200V.
Related Questions
3-9B2 Which of the following Ohms Law formulas is incorrect?3-9B3 If a current of 2 amperes flows through a 50-ohm resistor, what is the voltage across the resistor?3-9B5 If a current of 3 amperes flows through a resistor connected to 90 volts, what is the resistance?3-9B6 A relay coil has 500 ohms resistance, and operates on 125 mA. What value of resistance should be connected in series with it to operate from 110 V DC?