What is the total power in a circuit if the resistance is 800 and the voltage is 60 vdc?
a. 4.5 w
b. 13.33 w
c. 120 w
d. 48 w
user:
a circuit contains six 20 resistors connected in series. what is the total circuit resistance?
a. 60
b. 3.33
c. 6
d. 120
user:
what circuit quantity is measured by connecting a meter's test leads in series with an energized component?
a. voltage
b. current
c. power
d. resistance

1. A. 4.5 W

The power in a circuit is given by:

where V is the voltage and R is the resistance.

In this circuit, we have:

is the voltage

is the resistance

Therefore, the power in the circuit is

2. D.

The total resistance of resistors connected in series is the sum of the individual resistances:

In this case, we have 6 identical resistors with same resistance . Therefore, the total resistance will be

3. B. Current

An ammeter is a device which is put in series with another component of the circuit, in order to measure the current through it. In fact, in a circuit, components which are connected in series have the same current flowing through them: therefore, the reading of the current in the ammeter will corresponds to the same current which is flowing to the other component.

  the grams     of oxygen gas   that can be produced     is 20.6   grams of o₂

calculation

2liclo₃ →   2 licl + 3 o₂

step 1:   find the moles of liclo₃

moles = mass÷ molar mass

from periodic table the molar mass of liclo₃ =6.9 +35.5   +(16 x3) =90.4 g/mol

moles=38.7 g÷90.4 g/mol=0.4281   moles

step 2:   use the   mole ratio   to calculate the moles of o2

from equation above, liclo₃: o₂   is 2: 3  

therefore the moles of   o₂=0.4281 moles x3/2 =0.6422   moles

step 3: find mass   of o₂

mass= moles x molar mass

from periodic table the   molar mass of   o₂ = 16 x2= 32 g/mol

mass=0.6422   moles   x   32 g/mol = 20.6 grams of o₂