Subelement B: Electrical Math— Topic 9: Ohm’s Law-1
Question 3-9B3
Element 3 (GROL)If a current of 2 amperes flows through a 50-ohm resistor, what is the voltage across the resistor?
Explanation
This question involves Ohm's Law, a foundational principle in electronics and amateur radio. Ohm's Law describes the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit.
To find the voltage across a resistor, the formula derived from Ohm's Law is V = I × R.
Given:
* Current (I) = 2 amperes
* Resistance (R) = 50 ohms
Applying the formula:
V = 2 A × 50 Ω
V = 100 volts
Therefore, the voltage across the resistor is 100 volts. Understanding Ohm's Law is critical for anyone working with radio equipment, as it's essential for circuit design, troubleshooting, and power calculations. Options A, B, and C are incorrect as they do not follow the correct application of Ohm's Law.
Related Questions
3-9B1 What value of series resistor would be needed to obtain a full scale deflection on a 50 microamp DC meter with an applied voltage of 200 volts DC?3-9B2 Which of the following Ohms Law formulas is incorrect?3-9B4 If a 100-ohm resistor is connected across 200 volts, what is the current through 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?