The correct answer is: c) 820 Ω in a parallel circuit, the resistor with the highest resistance has the least current. In this case, the resistor with a resistance of 820 Ω has the least current among the resistors of 390 Ω, 560 Ω, and 820 Ω.
The resistor with the least current in a parallel circuit is the one with the highest resistance. This is because in a parallel circuit, the voltage across each resistor is the same, but the current is inversely proportional to the resistance.
To determine which resistor has the least current, we compare their resistance values:
- The resistor with a resistance of 390 Ω has the highest current because it has the lowest resistance.
- The resistor with a resistance of 560 Ω has a slightly lower current than the 390 Ω resistor because its resistance is higher.
- The resistor with a resistance of 820 Ω has the least current because it has the highest resistance among the three resistors.
Therefore, the correct answer is: c) 820 Ω