connecting of resistors

Question 1

expermint on parell

Answer 1

draw in page 18

1. connect circuit as shown
2. adjuist the rheostat to allow passing sutiable current
3. record the reading of the ammeters and voltmeters

V is constant

I is distributed

I = I₁ + I₂ + I₃

V \ R_eq = V\R₁ + V\R₂ = V\R₃

Question 2

expermin series

Answer 2

draw in page 18

1. conected circuit as shown
2. adjusit rehostat to allow sutiable current
3. record the reading of the ammeter and voltmeter

I is constant

V is distributed

V = V₁ + V₂ + V₃

IR_eq = IR₁ + IR₂ + IR₃

R_eq + R₁ +R₂ +R₂

Question 3

what is the rule for equel resistors

in parlell and series

Answer 3

1. R^\ \N
2. N x R</sup>

Question 4

for tw resistor in series and parllel

Answer 4

1. R₁ + R₂
2. R₁ x R₂ \ R₁ + R₂

Question 5

how to optain large resistance by using small resistance

and how to obtain smalll resistrance by using large resistance

Answer 5

1. concted in series
2. concted in parallel

Question 6

how to obtain large cuurent and why

Answer 6

conncted in parallel

because that will decreases the equivlant resistance

Question 7

how to obtain small current by concted and why

Answer 7

conncted in series

because that will increases the equivlant resistance

Question 8

three resistor are connected in pareallel one of them resistance one ohm , so their equivlant resistance = <1 >1 =1 differ from case to anthor

Answer 8

the equivlant resistance in parllel is the smaller than any resistance in the circet

Question 9

the total resistance of 10000 ohm and 1 ohm resistor connected in parallel is = 1 ohm , >10000 ohm < 1 ohm , between 1 ohm and 10000 ohm

Answer 9

the equivlant resistance in parllel is the smaller than any resistance in the circet

Question 10

give reason the home electrical devices are not connected in series

Answer 10

To keep the circuit of closed even one of them is closed to keep potential diffreance constant (220 v ) so each instrument will draw its suitable normal working current

Question 11

when the length of the conductor increases ( at constant cross - sectional area ) also resistance will increase GR

Answer 11

because it may be considered as several conductors connected series , so the friction between the electrical charges and the molecules of the conductor will increace R=P.L / A R&L at constant other factor

Question 12

when the cross - sectional area of the conductor increases ( at constant length ) also resistance will decrease GR

Answer 12

because it may be considered as several conductors connected paralel, so the friction between the electrical charges and the molecules of the conductor will decrease R=P.L / A R&1/A at constant other factor

Question 13

in electric circuits connected in parallel , thick wires are used at the ends of the battery , but at the ends of each resistors less thick wires are used GR

Answer 13

thick wire should be used at ends of the battery to be able to carry the strong current with small resistance , then the current will be divided in parallel resistors

Question 14

the filament of lamp in the house is cut off , the other lamp still lightening GR

Answer 14

because they are connected in parallel

Question 15

the home electrical devices are not connected in series GR

Answer 15

1. to kepp the circuit of each electrical device always closed even one of them is switched off
2. to keep the potential difference constant between the terminals of each instrument 220 V so each instrument each sutiable normal current

• but the total power consumed will increases because the total resistance of the circuit will decreases so the total current intensity the source will increases