How can we identify the positive terminal of a cell or a battery concealed in
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The polarity of an electrical circuit only comes into question in DC (Direct Current) circuits. Batteries are a DC storage device that has the positive (anode) and negative (cathode) terminals clearly marked with a + or - symbol. Small batteries like AA, AAA, C, or D are marked this way plus are further distinguished by the small circular protruding knob on positive terminal.
Car batteries have two posts which are clearly embossed with raised + (positive) and - (negative) symbols at the terminals. You should also be able to further distinguish the +/- poles by the color of the wiring attached to them. Positive terminals have the RED wire attached to them and the negative wires are black. In most American electrical systems the ground wire is attached to the negative terminal so you may also find a bare, flat braided wire running to the frame of the vehicle or implement.
Only DC circuits show polarity so if you were to use an analog voltmeter from the terminal to ground the direction of the needle will show polarity. The test leads are marked + and - and are colored RED (+) and BLACK (-). If testing correctly the meter needle will deflect to the right to measure voltage. If the polarity is wrong the needle will bury left. On a DVM the LED display will indicate polarity with a + or - sign.
Hope it's helpful
Car batteries have two posts which are clearly embossed with raised + (positive) and - (negative) symbols at the terminals. You should also be able to further distinguish the +/- poles by the color of the wiring attached to them. Positive terminals have the RED wire attached to them and the negative wires are black. In most American electrical systems the ground wire is attached to the negative terminal so you may also find a bare, flat braided wire running to the frame of the vehicle or implement.
Only DC circuits show polarity so if you were to use an analog voltmeter from the terminal to ground the direction of the needle will show polarity. The test leads are marked + and - and are colored RED (+) and BLACK (-). If testing correctly the meter needle will deflect to the right to measure voltage. If the polarity is wrong the needle will bury left. On a DVM the LED display will indicate polarity with a + or - sign.
Hope it's helpful
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