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Current Electricity II Lowersixth Science Physics
 

Current Electricity II Lowersixth Science PhysicsOnline version

AC/DC, RMS, and circuit symbols true/false

by YAKILI LMS
1

AC current changes direction periodically.

2

A variable resistor can change the circuit current.

3

RMS stands for root mean square.

4

The RMS of current in a resistor under AC can be used to find average power.

5

The symbol for a light bulb in many diagrams is a circle with a cross or filament.

6

The RMS value of a DC current is always zero.

7

Resistance in a conductor generally increases with temperature.

8

Ohm's law relates voltage, current, and resistance as V = IR.

9

AC circuits can contain resistors, capacitors, and inductors.

10

Conductors have low electrical resistance.

11

DC voltage has a constant polarity.

12

A mixed RLC circuit can display complex impedance.

13

A sine-wave AC current has a well-defined peak, trough, and zero crossings.

14

In a parallel circuit, the voltage across each branch is the same.

15

A resistor is symbolized by a zigzag line in circuit diagrams.

16

An inductor stores energy in a magnetic field.

17

A switch can be used to open or close a circuit.

18

A fixed resistor is often used to limit current in a circuit.

19

A cell is a single electrochemical source, smaller than a battery.

20

For a sine wave, the RMS value is the peak value divided by the square root of 2.

21

An ammeter is connected in series to measure current.

22

The total resistance in series is the sum of individual resistances.

23

Power dissipated in a resistor is P = VI = I^2R = V^2/R.

24

The RMS of a DC quantity equals its constant value.

25

A inductor is symbolized by a series of curved lines in circuit diagrams.

26

A combined RC circuit contains a resistor and a capacitor.

27

In a series circuit, different components can have different currents.

28

AC voltage varies sinusoidally in many household supplies.

29

A voltmeter should be connected in series with a component to measure voltage.

30

A multimeter can measure AC and DC values for voltage and current.

31

RMS helps compare heating effects of AC and DC.

32

The total resistance in parallel is found by summing reciprocals of resistances.

33

RMS values are useful for heating effects in AC circuits.

34

Electric current can be either alternating (AC) or direct (DC).

35

In a direct current circuit, the current flows in one direction only.

36

In a parallel circuit, the current splits among branches.

37

A resistor converts electrical energy into heat.

38

RMS value is especially applicable for sinusoidal waveforms.

39

Ohm's law can be applied to circuits containing resistors in series and parallel.

40

In an AC supply, peak voltage is higher than the RMS voltage by a factor of √2.

41

A voltmeter is connected in parallel to measure potential difference.

42

A combined RL circuit contains a resistor and an inductor.

43

In a series circuit, the same current flows through all components.

44

Kirchhoff's current law states that the total current entering a junction equals the total leaving.

45

RMS value represents the effective value of an alternating quantity.

46

A fuse is a protective device that breaks the circuit when overloaded.

47

A battery symbol usually shows a long and a short line.

48

A capacitor is symbolized by two parallel lines in circuit diagrams.

49

Kirchhoff's voltage law states that the sum of potential differences around a loop is zero.

50

Insulators have very high electrical resistance.

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