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Flashcards in topic 2 Deck (12)
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1

As the VOLTAGE across a FILAMENT LAMP increases, how does the CURRENT change?

It INCREASES, proportionally at first, but then levels off at a higher voltage

2

What type of supply is the MAINS electricity?

AC supply

3

The ---(1)--- wire is at, or close to the earth potential ---(2)---.

1: neutral; 2: 0 V

4

In a simple electrical circuit containing only a CELL and two EQUAL resistors in PARALLEL, we would find that the CURRENT through each resistor would be…

an EQUAL SPLIT of the current from the cell; the P.D. across each would be EQUAL to that of the p.d. across the cell.

5

What does OHM'S LAW state?

Voltage = current x resistance

6

The CURRENT in the branches of a PARALLEL circuit should always be…

EQUAL in TOTAL to the current from the supply

7

On a CURRENT-POTENTIAL DIFFERENCE graph, a DIODE will be shown as…

a flat line with a DRASTIC increase

8

When DRILLING a hole, a drill TRANSFERS energy from…

CHEMICAL to ELECTRICAL to KINETIC energy.

9

The energy resources used for MEDIUM energy supplies, generally consumed in WORKPLACES, tend to be primarily…

NON-RENEWABLE energy sources, that are often supplemented by RENEWABLE sources

10

Which of these relationships is accurate for calculating ENERGY used?

Energy (J) = power (W) x time (s)

11

Lubrication is used so that when work is done against ---(1)--- acting on an object, it SLOWS DOWN the temperature INCREASE of the object. This will ---(2)--- the amount of useful energy DISSIPATED.

1: frictional forces; 2: decrease

12

The power transfer in any circuit device is related to the current in it and the ---(1)--- across it, as well as the ---(2)--- over time.

1: potential difference; 2: energy changes