In parallel with the ideal switch is the contact leakage resistance and capacitance.

与理想开关相并联的是触点漏泄电阻和电容。

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When switching a voltage source to multiple devices, it may become necessary to compensate for voltage drops due to switch resistance.

在将一个电压源切换至多个装置时，则可能必须补偿由于开关电阻引起的压降。

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PLC is as the core of hardware system, and it comprises stepper motor, proximity switch, photoelectric switch, hot resistance, electromagnetic valve et al.

硬件部分采用PLC作为控制核心部件，由步进电机、接近开关、光电开关、热电阻、电磁阀等组成。

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Going forward, this trendline could switch roles to act as resistance.

FORBES: by Elizabeth Harrow

For example, Zeneca has managed to switch the bt gene, which gives maize plants resistance to nasty insects, on and off using another chemical trigger.

ECONOMIST: Terminator genes