resister is nothing but a 'clay' which will reduce the flow of current. There by limiting the volt.
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you divide the volts by the ohms
To impede the flow of current
Using Ohms Law, the answer is 120/0.5 = 240 Ohms.
series network consists of components i.e resisters connected end to end. since their is only one path for the flow of current. but potential drop across each resister is different. so thats the reason that series network has maximum resistence then the highest resister in combination. the same amount of current passes through each resister.
called an insulator