A torque wrench is an essential part of any DIY auto mechanic's tool kit. How do torque wrenches work, and how do you use one properly?

A torque wrench is an essential part of any DIY auto mechanic's tool kit. How do torque wrenches work, and how do you use one properly?

T—Torque desired (the actual torque to be applied to the fastener) Example: What should the dial read or the "click" setting be when A = 12 inches, B = 6 inches, and T—30 lb./ft.