{"id":1537,"date":"2020-12-02T05:32:20","date_gmt":"2020-12-02T00:02:20","guid":{"rendered":"https:\/\/cbselibrary.com\/?p=1537"},"modified":"2020-12-02T15:23:02","modified_gmt":"2020-12-02T09:53:02","slug":"flow-of-current-in-metal","status":"publish","type":"post","link":"https:\/\/cbselibrary.com\/flow-of-current-in-metal\/","title":{"rendered":"Flow Of Current In A Metal"},"content":{"rendered":"
Flow of electric current\u00a0<\/strong> <\/p>\n Precaution:<\/strong> Never connect the two terminals of a cell with a wire without an appliance connected in a circuit. This will cause overheating of the wire and also destroy the cell.<\/p>\n Making a Simple Electric Circuit<\/strong> <\/p>\n Electric current flows in a particular direction. In an electric circuit, the electric current flows from the positive terminal to the negative terminal of the electric cell. Figure 14.7 shows the direction of flow of electric current in a circuit.<\/p>\n
\nThree basic conditions are required for an electric current to flow.
\nA device used to produce an electric current like cell, battery, or a plug point acting as a source.
\nA wire made of a metal like copper, silver, or aluminium, which will allow electric current to flow through easily.
\nAn unbroken loop (of the wire) running from one terminal of the source, through various appliances, back to the other terminal of the source.<\/p>\n
\nWhen we connect the terminals of a pencil cell (name given to the cell due to its shape) to a bulb using two wires, the bulb glows. This happens because we provide a path for the current to flow. A path for an electric current to flow is called an electric circuit.
\nIn Figure (a), one wire from the pencil cell is connected to the torch bulb, while the other wire is not. The electric circuit is not complete here. In Figure (b), both the wires from the cell are connected to the torch bulb. The electric circuit is complete in this case. Electric current flows only if there is an unbroken path or closed circuit starting from one terminal of the source, through the torch bulb, to the other terminal of the source. Thus, the bulb glows in Figure (b) but not in Figure (a). The circuit in Figure (a) is not complete. Hence, current cannot flow through the circuit and the bulb does not glow. Such a circuit is called an open circuit. The circuit in Figure (b) is complete. Electric current flows through the circuit and, as a result, the bulb glows. Such a circuit is called a closed circuit.<\/p>\n