The document discusses different types of electric cell connections. It describes series, parallel, and combination connections. For a series connection, the voltage adds up but the current remains the same. For a parallel connection, the current adds up but the voltage remains the same. A combination connection uses both series and parallel configurations together. Calculations are provided for voltage, current, and resistance based on the number and properties of the cells in each type of connection.
15. RT = rT + R
ET
IT =
RT
= I1 + I 2
= I3 + I4
IT
I1 = I2 = I3 = I4 =
2
ET1 = E1 w I1.r1 ! E2 w I2.r2
ET2 = E3 w I3.r3 ! E4 w I4.r4
2.5 ก ' 7 2.15 1 IT, I1, I2, I3, I4, ET1, ET2 %# V
.! r1 = r2 = r3 = r4 = 2 Ω %# E1 = E2 = E3 = E4 = 6 V
R= 6 Ω
!" ก E1 = E2 = 6 V
E2 = E2 = 6 V
' ( ET = E1 + E2
= 6+6
= 12 V
r1 × r2
rT1 =
r1 + r2
2× 2
=
2+2
= 1Ω
r3 × r4
rT2 =
r3 + r4
2× 2
=
2+2
= 1Ω
rT = rT1 + rT2
= 1+1
= 2Ω
RT = rT + R
= 2+6
= 8Ω
16. ET
IT =
RT
12
=
8
= 1.5 A
IT
I1 = I2 = I3 = I4 =
2
1.5
=
2
= 0.75 A
ET1 = E1 w I1.r1
= 6 w (0.75 × 2)
= 4.5 V
ET2 = E3 w I3.r3
= 6 w (0.75 × 2)
= 4.5 V
V = IT.RT
= 1.5 × 8
= 12 V