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.

b. false

explanation:

suppose a rock in free fall is dropped off a cliff. after falling for 5 seconds, its speed would not be 100 m/s.