The heating element of a iron consists of two identical resistance wires .
When it operates at 110V ,it connects in parallel
When it operates at 220V ,it connects in series
WHY?
點解220v 要series 同110v 點解要parallel
f5 physics
2010-04-06 12:49 am
回答 (3)
2010-04-06 1:06 am
✔ 最佳答案
When connected into seriesV = I (2R)
V/2 = IR
110 = IR
When connected into parallel
voltage across each resistor is 110V also, thus, the same voltage will be across on them in each situation!
參考: me!
2010-04-06 4:48 am
I thinks it will not in F.5 Levels.
will it supplied with 220V,
the identical heating elements in series will share with 220V,so the voltage of the each two heating element is 110V respectively.
will it supplied with 110V,
the identical heating elements in parallel will having 110V simulyaneously,so the voltage of the each two heating element is 110V respectively.
will it supplied with 220V,
the identical heating elements in series will share with 220V,so the voltage of the each two heating element is 110V respectively.
will it supplied with 110V,
the identical heating elements in parallel will having 110V simulyaneously,so the voltage of the each two heating element is 110V respectively.
2010-04-06 1:07 am
The design that the two heating elements are connected in parallel indicates that the rated power of each element is undera voltage of 110v. In case the two elements are still connected in parallel under 220v, they certainly will be burnt.
By connecting the heating elements in series under 220v, each of the element will share half of the voltage of 220v, i.e. 110v. Under such situation, the two heating elements will be operated under their rated power.
By connecting the heating elements in series under 220v, each of the element will share half of the voltage of 220v, i.e. 110v. Under such situation, the two heating elements will be operated under their rated power.
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