Question

1. Which combination of resistors is used to decrease current in a circuit?
2. 100 joules of heat is produced per second in a 42 resistor. What is the p.d across resistor?
3. In series combination of resistors, the current is
in every part of the circuit.
4. The resistance of a wire is directly proportional to cross-sectional area. (True False)
5. By what other name is the unit joule/coulomb called?​

Answer 1

Answer:

1. Series combination is used to decrase the current flow ,because in series combination the magnitude of resistance increases ,therefore the flow of current is decreased..

2. H = $\frac{V^{2} }{R}$*T.    H = 100J , T = 1s , R = 42Ω

    $V^{2}$ = $\frac{H*R}{T}$    

      $V^{2}$  =  $\frac{100 * 42}{1}$ = 4200

   V = $\sqrt{4200}$

   V = 64.8Ω  = 65Ω .

3. In series combination of resistors the cureent in every part of the circuit is same .

4.The given statement is false . because resistance of a wire is inversly proportional to cross-sectional area..

5. The other name for joule\coulomb is volt...