Temperature, light intensity, air currents, and humidity are some of these factors. Different plants also vary in the rate of transpiration and in the regulation of stomatal opening. In this lab, you will measure transpiration under various laboratory conditions using a potometer.ater will then move into the mesophyll cells by osmosis from surrounding cells with high water potentials, including the xylem. As each water molecule moves into a mesophyll cell, it exerts a pull on the column of water molecules existing in the xylem all the way from the leaves to the roots.
A starter solenoid (or starter relay) is the part of an automobile which switches a large electric current to the starter motor, in response to a small control current, and which in turn sets the engine in motion.hen low-current power from the starting battery is applied to the starter solenoid, usually through a key-operated switch, the solenoid closes high-current contacts for the starter motor and it starts to run.
Solenoid Mechanics. A solenoid has a coil set that it uses to induce a magnetic field on a permanent magnet. The magnet will either be attracted or repelled when power is applied to the coil. In a car, the solenoid in the starter is a relay which moves metal contacts into place which closes a circuit. The solenoid is sent an electrical current when the ignition key is turned. This triggers the magnetic field of the solenoid that pulls on the contacts, closing the circuit.