The power of a device is maximum when its resistance
is the same as that of the power source
2 of 15
A wire of resistance 4 Ohms is folded in half and then twisted. Its new resistance in Ohms,
4
3 of 15
Ohm's Law can be applied to a light bulb when
it has reached a steady temperature
4 of 15
When resistors are in parallel, the total resistance is
less than the smallest resistance in the circuit
5 of 15
If two equal resistors of 20 Ohms each are connected in parallel, the total resistance in Ohms
10
6 of 15
An earth wire is needed for an electrical equipment with
metal casing
7 of 15
A switch is normally connected across
the live wire
8 of 15
The National Grid uses thick copper wires in order to
keep the resistance low
9 of 15
In the event of a drop in voltage, a bulb could go
dim
10 of 15
If two resistors are connected in series, the total resistance is 25 Ohms. If they are connected in parallel, it goes down to 6 Ohms. The possible values of the resistances in Ohms are
15 and 10
11 of 15
The ratings of a bulb is 60 W, 240 V. Its resistance in Ohms is
960
12 of 15
Three cells, EMF 6 V each, are connected in parallel. The total EMF is
18 V
13 of 15
The resistance of an ammeter, in theory, is
0 Ohms
14 of 15
The terminal potential difference of a battery is
less than the EMF when there is a current
15 of 15
Other cards in this set
Card 2
Front
The power of a device is maximum when its resistance
Back
is the same as that of the power source
Card 3
Front
A wire of resistance 4 Ohms is folded in half and then twisted. Its new resistance in Ohms,
Back
Card 4
Front
Ohm's Law can be applied to a light bulb when
Back
Card 5
Front
When resistors are in parallel, the total resistance is
Comments
No comments have yet been made