these electrons carry ___, the the bulb lights up as electrons pass through it
energy
2 of 20
the electrons return to the cell with no energy. where do they get more energy?
battery
3 of 20
what can be used to measure the energy the electrons carry when leaving the cell?
voltmeter
4 of 20
so if a voltmeter measured 9 volts, what would that mean?
electrons are carrying 9 volts of energy
5 of 20
if you measured the volts of a cell and a bulb, without any resistance, would they be the same?
yes because the volts of energy given to electrons through cell are being given to bulb
6 of 20
what would happen to the potential difference (volts) acorss 2 bulbs in a circuit? would they still be the same as the PD across the cell?
no, they would be half the PD across cell - IF the bulbs were the same
7 of 20
would a bulb with a higher PD be brighter then one with a lower PD?
yes - higher PD = more energy - brighter
8 of 20
the amount of PD (energy) required to drive electrons (current) through a component is called the...
resistance
9 of 20
how do you work out resistance?
PD / current [PD = current x resistance]
10 of 20
if a component has a higher resistance, is the PD lower or higher?
higher
11 of 20
explain why
if there's a higher resistance, more energy is requires to pass a current through that compenent, meaning th PD (energy needed to drive a current) would also be higher
12 of 20
what do resistors do?
restrict current flow [as current flow through resistor, it experiences resistance]
13 of 20
a resistor contains fixed, postsive __
ions
14 of 20
as electrons flow through resistor, they collide with the fixed ions. what does his result in? (energy...)
electrical energy of electrons (from traveling around circuit) being transferred to thermal energy in ions, emitted from resistor
15 of 20
a thermistor is a type of resistor that changes the resistance based on the temp. as the temp increases, the resistance ____
decreases
16 of 20
at low resistance, would the current be low or high?
high
17 of 20
thermnistors detect temp increase and can turn on a device to act on change. Name three things a thermistor is used for
thermostat (heating), fire alarm, fridge/freezer
18 of 20
LDR decreases the resistance as the light intensity ___
increases
19 of 20
LDR can be used as light sensors as they detect increase in light intensity and turn on a device to act on change. What products are an example of this?
street lights, camera
20 of 20
Other cards in this set
Card 2
Front
these electrons carry ___, the the bulb lights up as electrons pass through it
Back
energy
Card 3
Front
the electrons return to the cell with no energy. where do they get more energy?
Back
Card 4
Front
what can be used to measure the energy the electrons carry when leaving the cell?
Back
Card 5
Front
so if a voltmeter measured 9 volts, what would that mean?
Comments
No comments have yet been made