Flashcards in topic 2 Deck (12)
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
What type of supply is the MAINS electricity?
The ---(1)--- wire is at, or close to the earth potential ---(2)---.
1: neutral; 2: 0 V
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.
What does OHM'S LAW state?
Voltage = current x resistance
The CURRENT in the branches of a PARALLEL circuit should always be…
EQUAL in TOTAL to the current from the supply
On a CURRENT-POTENTIAL DIFFERENCE graph, a DIODE will be shown as…
a flat line with a DRASTIC increase
When DRILLING a hole, a drill TRANSFERS energy from…
CHEMICAL to ELECTRICAL to KINETIC energy.
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
Which of these relationships is accurate for calculating ENERGY used?
Energy (J) = power (W) x time (s)
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