Static power is present when the circuit is idle due to leakage. Which statement is true?

Static power is present when the circuit is idle due to leakage. Which statement is true?

• A. It disappears whenever the circuit stops switching.
• B. It is present when the circuit is idle due to leakage.
• C. It is proportional to the number of switching events.
• D. It is not affected by leakage.

Answer: (B)

Static power comes from leakage currents and is present even when nothing is actively switching. In idle mode, transistors still conduct a small leakage current from Vdd to ground, so the power drawn is this leakage current times the supply voltage. That’s why the correct idea is that static power is present when the circuit is idle due to leakage. It doesn’t disappear just because switching stops, because leakage persists; it isn’t tied to the number of switching events—that would describe dynamic power. And static power is directly affected by leakage levels, which depend on factors like temperature and supply voltage.

Static power comes from leakage currents and is present even when nothing is actively switching. In idle mode, transistors still conduct a small leakage current from Vdd to ground, so the power drawn is this leakage current times the supply voltage. That’s why the correct idea is that static power is present when the circuit is idle due to leakage. It doesn’t disappear just because switching stops, because leakage persists; it isn’t tied to the number of switching events—that would describe dynamic power. And static power is directly affected by leakage levels, which depend on factors like temperature and supply voltage.