I am designing a circuit for [a solenoid valve from BIO-CHEM](http://www.biochemfluidics.com/pdf/pinch_valves_0509.pdf). My product number is 075P2N024-02SQ. I want to know the resistance of the valve in order to decide how big a resistance I should use in series. Here is the printscreen of electrical chart.

![electrical](https://i.stack.imgur.com/XlIat.png)

1. I use "Power:2.8w" and "Current:0.1 amps"to get one value of resistance: 280 ohm.
2. I use "Voltage:24VDC" and " Current:0.1 amps" to get one value of resistance: 240 ohm.
3. I use "Power:2.8w" and "Voltage:24VDC" to get one value of resistance: 205.714 ohm.
4. I use a ohmmeter to get the value: 213.6 ohm

Which one should I believe?