If the voltage across a capacitor in an AC circuit is 100 V and the capacitive r
Practice Questions
Q1
If the voltage across a capacitor in an AC circuit is 100 V and the capacitive reactance is 50 ohms, what is the current? (2020)
2 A
0.5 A
5 A
10 A
Questions & Step-by-Step Solutions
If the voltage across a capacitor in an AC circuit is 100 V and the capacitive reactance is 50 ohms, what is the current? (2020)
Step 1: Identify the voltage across the capacitor, which is given as 100 V.
Step 2: Identify the capacitive reactance, which is given as 50 ohms.
Step 3: Recall Ohm's law, which states that current (I) is equal to voltage (V) divided by resistance (or reactance in this case).
Step 4: Substitute the values into the formula: I = V / Xc.
Step 5: Calculate the current: I = 100 V / 50 ohms.
Step 6: Perform the division: 100 divided by 50 equals 2.
Step 7: Conclude that the current is 2 A.
Ohm's Law in AC Circuits – Ohm's Law can be applied to AC circuits involving capacitors, where current (I) is calculated as voltage (V) divided by capacitive reactance (Xc).
Capacitive Reactance – Capacitive reactance (Xc) is the opposition that a capacitor offers to the flow of alternating current, measured in ohms.
