Question

The resistance, Rohms, of some wire is directly proportional to its length, Imm. A piece of wire 600 mm long has a resistance of 2.1 ohms. a Find the resistance of a 1.5m length of this wire. a b Find the formula connecting R and l. c Tamas needs to make a 7.7 ohm resistor. How many metres of wire does he need?

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Answer 1

Answer:

Step-by-step explanation:

a. 600mm=0.6m

0.6/2.1 = 1.5/x

x=5.25ohms

b. V=IR

c. 0.6/2.1 = y/7.7

y = 2.31ohms