Negative voltage in Mesh Current Analysis

analysis

I am trying to learn about Mesh Current Analysis and have a question

I was reading this explanation on the subject from electronics-tutorials.ws:

http://www.electronics-tutorials.ws/dccircuits/dcp_5.html

mesh circuit

and one of the equations is \$-20 = -40I_1 + 60I_2\$

I understand where \$-40I_1 + 60I_2\$ comes from, and I'm assuming -20 is taken from the voltage and it is given as negative because the loop goes clockwise, can someone confirm why -20 is negative, please?

Thanks

Best Answer

Right, the -20 in that equation is negative because the 20 V voltage source would tend to create a current in the opposite direction of (the loop current) I2.

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