2006-06-06 00:34:59 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
Because an ammeter is set in serial and has to be able to carry the entire current through the circuit it measures, while a voltmeter is connected in parallel and barely draws any current at all.
2006-06-06 00:38:12 · answer #1 · answered by Anonymous · 0⤊ 0⤋
In ammeters, the cross sectional diameter of the wires must be large so that it can carry large current. The current that you want to measure directly flows into ammeter coz you have to connect them in series with load. But if you use clamp ammeters, you won't need to use such thick wires.
In voltmeters, you don't need to use thick wires coz it just measure the voltage. Since voltmeters connect in parallel with the load, the load current will not flow in voltmeter circuit.
2006-06-06 03:16:02 · answer #2 · answered by Peace TN 1 · 0⤊ 0⤋
Consider the analogy between the flow of water and electricity. Voltage is like water pressure and electric current is like water flow. Pressure gages connected to a large pipe may be very small but the water meter must pass all the water that the pipe must pass. Voltmeters (pressure) can have thin wires but ammeters (current) must pass all the electricity flowing in the circuit. Hope that helps a little.
2006-06-06 03:19:06 · answer #3 · answered by Kes 7 · 0⤊ 0⤋
because in ammeter large currents flows throughthe wire and it is connected in series
whereas in voltmeter it is connected in parallel so only small currents flows through it thats y thinner wires for voltmeter
2006-06-06 01:37:51 · answer #4 · answered by alooo... 4 · 0⤊ 0⤋
May I also add that the current flowing through the voltmeter is small because ideally , its resistance is infinity , apart from the fact that it is connected in parallel .
2006-06-06 02:42:40 · answer #5 · answered by Harish 2 · 0⤊ 0⤋