Resistors in Series and Parallel

Direct-current (DC) circuit

in this circuit, current flows in one direction only without reversing.

Direct-current (DC) circuit

this circuit is used in battery-powered devices, car electrical systems, and computers.

Alternating-current (AC) circuit

in this circuit, it allows the electric current to reverse direction (reversing at regular intervals)

Alternating-current (AC) circuit

this circuit continually alternates direction.

Alternating-current (AC) circuit

this circuit is used in homes and can be produced and transmitted over long distances much more easily than DC.

true

t or f
All circuits contain resistors.

true

t or f
A single circuit may contain a combination of resistors (e.g., string of light bulbs)

series connection

in this connection, there is a single path for current to flow

in series

Resistances are said to be connected in this connection when they are joined such that the current passing through any one of them is the same current passing through the other resistances in the combination

in series

What connection if there is no accumulation of charges at any section of the combination, the current passing through the resistance is the same current I, which is also the current through the group?

ohm’s law

resistance in series can use this law to the whole group and also to each resistance in the group.

false (in series)

t or f
In parallel, the total voltage across the group Vt is equal to the sum of the separate voltages across the resistances in the group.

true

t or f
in series, the equivalent resistance of the combination is equal to the sum of the separate resistances

current and resistance

individual resistances in series can be added directly since the voltage across each resistance is directly proportional to the —— and ———.

in series

what connection where it is clear from the arrangement that appliances cannot be controlled separately

series

series or parallel
When one is disconnected, the rest will also be disconnected.

series

what connection do lamps usually have?

in parallel

In this connection there are more than one continuous path for current to flow and the voltage is constant throughout all the elements

in parallel

Resistance are said to be connected in this connection when the total current divides among the voltage across each of them is equal to the voltage across the combination.

in parallel

The voltages across the resistance are equal and they are also equal to the voltage across the combination. What connection?

true

t or f
When resistors are connected in parallel, the reciprocal of the joint resistance is equal to the sum of the reciprocals of the separate resistances.

110 or 220

Lamps and other appliances in our homes are connected in parallel, the common voltage being the line voltage, either — volts or —- volts.

in parallel

There is a separate control for each lamp or appliance in this connection.

true

t or f
Putting on any lamp in the house means inserting one more branch in the parallel combination

false, in parallel

t or f

In series, when the house is far from the source of power, the lamps grow dim whenever a toaster, an electric iron, or any other powerful appliance is turned on

true

t or f
in parallel, when the appliance is turned on, the current passing through the line is increased.

dims

This large drop in the line of voltage decreases the voltage available at the entrance to the house, and hence the lights —-.

true

the reciprocal of 𝑅𝑇 in a parallel combination is equal to the sum of the reciprocals of each resistance in the circuit

false, in parallel

in series, voltage is constant in all resistor

false, in parallel

in series, total current is equal to the sum of the individual currents

true

true or false
in parallel connection, current is proportional to the voltage and inversely proportional to the individual resistances.

false, possible

t or f

combination of both series and parallel connections is impossible.

true

t or f
The current passing through each resistor in parallel connection adds directly since current is proportional to the voltage.

Resistance

What is an electrical quantity that refers to the opposition of a material to the flow of charges. It is measured in ohms (Ω).

true

t or f
Individual resistances in series can be added directly since the voltage across each resistance is directly proportional to the current and resistance.

false, in parallel

t or f
Individual resistances in series add reciprocally since current is proportional to the voltage and inversely proportional to the individual resistances.