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Potential Difference and Electromotive Force Lowersixth Science Physics
 

Potential Difference and Electromotive Force Lowersixth Science PhysicsOnline version

Quick true/false on emf, ammeters/voltmeters, power and kWh.

by YAKILI LMS
1

The energy consumed by a device in 1 hour at 1 kW is 0.5 kWh.

2

A voltmeter is connected in series with the component it measures.

3

P = I^2 R is not a real formula.

4

Electrical energy E = P × t.

5

A circuit with no energy transfer has nonzero power.

6

The ammeter has low resistance to minimize voltage drop in series.

7

A voltmeter can measure current.

8

The watt-hour is the same as the kilowatt-hour.

9

1 kWh = 3.6 × 10^6 joules.

10

The emf of a battery is the maximum potential difference when no current flows.

11

The unit of energy is joule.

12

Power rating in watts equals joules per second.

13

1 kWh equals 1,000 joules.

14

Internal resistance reduces the terminal voltage under load.

15

A voltmeter is connected in parallel with the component it measures.

16

A real wire with zero resistance would cause infinite current from any voltage.

17

The emf is always greater than the terminal voltage in a battery under no load.

18

Energy in joules equals power in watts times time in seconds.

19

The unit of emf is the ampere.

20

A wattmeter measures electrical power.

21

The kilowatt-hour is smaller than the joule.

22

An ammeter is connected in series with the circuit.

23

The ammeter has high resistance.

24

In a circuit with a 5V supply and a 2Ω resistor, current is 3 A.

25

The kilowatt-hour is not a unit of power but energy.

26

The kilowatt-hour is a unit of power.

27

In parallel circuits, voltage across components is the same.

28

In series circuits, current changes as it passes through components.

29

The resistance of a perfect conductor is infinite.

30

A circuit with a 12 V supply and a 3 Ω resistor has current 4 A.

31

The unit of emf is the volt.

32

The kilowatt-hour is a unit of time.

33

The emf of a battery is always equal to its terminal voltage under load.

34

A watt is a unit of energy.

35

The unit of energy is volt.

36

Electrical energy is measured in volts.

37

A voltmeter should have very high resistance to minimize current draw.

38

EMF stands for electromotive force.

39

An ideal voltmeter has zero resistance.

40

Internal resistance of sources increases current when connected.

41

In series circuits, current is the same through all components.

42

A device labeled 'kWh' indicates energy consumption over time.

43

Ohm's law says V = R / I.

44

P = IV is derived from definitions of power and current.

45

Electrical power P = V × I.

46

The voltage across a resistor in a parallel circuit is different for each branch.

47

The kilowatt-hour is a unit of energy equal to one kilowatt used for one hour.

48

A voltmeter should be connected in series to measure voltage.

49

An ammeter is connected in series to measure the current in a circuit.

50

The emf of a cell is the maximum potential difference it can supply when no current flows.

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