EXAMPLE The lever ABC is pin supported at A and connected to a short link BD as shown in Fig. 5-22a. If the weight of the members is negligible, determine the force of the pin on the lever at A. SOLUTION 0.5 m 400 N 400 N 45 0.5 m 45° 0.5 m 0.2 m 45° 450 0.2 m 0.2 m F D 0.4 m 0.1 m 0.1 m (a)

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Electric Circuit and Components

An electrical circuit or electrical network is a pre-determined pathway to make the electrons flow in the desired direction. The flow of electrons will set up a current flow in the circuit. Normally, the flow of electrical current is opposite to the flow of electrons. An electron is a fundamental sub-atomic particle of an atom possessing a negative charge. To initiate the flow of current and achieve the desired output, the electrical circuit should necessarily be composed of closed pathways. The pathways are made-up of good conductors of electricity such as aluminium and copper.