Answer:
Q1) a:
Resistors are connected in series
[tex]R_t = R_1 + R_2 + R_3 = 20+ 10 +40 =70 ohms
[/tex]
b: V= IR
I=V/R= 12/70 A
remember that current is the same throughout the circuit of a series connection
c: V = 12/70 (10) Volts
Q2): from the circuit diagram, the Resistors are connected in parallel..
1/R = 1/R1 + 1/R2 +1/R3
then take the reciprocal
Apply ohms law to get the current
recall that voltage is the sane across all components in parallel
Q3) Linear relationship between voltage ND current, with the Resistor in this case is the constant of proportionality, recall y=mx
Q4)
Electrical Power P = VI measured in Watts
another way to define P in the eyes of calculus
P = dE/dt in which power is the rate of change of Electrical Energy... hence power is measured in Joules/sec =1W
Electrical Energy E = VIt or E=Pt measured in Joules also measured in Wh
Q5) Resistors fuses and insulation can prevent devices from causing fire in general...
Avoiding faulty design and damaged cables or wrong connection causing short circuit...
Q6) The type of circuitry I would employ, would be connecting the devices in parallel.
Assume your tv in series with your refrigerator, let's assume TV burned out, because it is connected in series the refrigerator won't function as well, so the appliance failure caused the whole circuit to fail.
In parallel circuitry the devices are independent of each other, if one burns out the rest of the devices won't be effected.
So if the TV burns out the refrigerator will continue to work.
Therefore, we will connect the devices in parallel.
