21. Stretching the analogy with the electric circuit further, one arrives at the following expression for the response time: 22. At each node of an electric circuit one writes the currents coming in and out of the node. 23. Every electric circuit is potentially explosive. 24. The three-level arrangement is also used for traction current pylons with 6 electric circuits ( 12 conductor cables ). 25. Drawings of electric circuits , a candle, laces and threads were also recovered from Amir's cell, said Israel's Prisons Authority. 26. To make a chip, thousands of tiny electric circuits are imprinted on pieces of silicon smaller than a matchbox. 27. In many electric circuits , the length of the wires connecting the components can for the most part be ignored. 28. His research work in the 1930s concerned non-linear electric circuits , and subsequently electric arcs and high temperature plasma phenomena. 29. Electric circuits caused perforations to be cut in a ticker tape attached to the face of the customer's key.30. The two said they will work on the technology needed to engrave microscopic electric circuit lines onto silicon wafers.