GCSE Physics
Home > Flashcards > Print Preview
The flashcards below were created by user
ghoran
on
FreezingBlue Flashcards. What would you like to do?

What is the symbol for a switch


What is the symbol for a key

What is the symbol for a cell

What is the symbol for a battery

What is the symbol for a diode

What is the symbol for a resistor

what is the symbol for a variable resistor

What is the symbol for an LED

what is the symbol for a lamp

what is the symbol for a fuse

Wheat is the symbol for a voltmeter

What is the symbol for a thermistor

what is the symbol for an ammeter

what is the symbol for an LDR

Current flowing through a component in a circuit is measured in
Amperes (A) using an ammeter connected in a series with a component

The current through a component depends on
It's resistance

The greater the resistance the ...... The current per a given p.d. Across the component
Lower

Adding extra bulbs in series add
Extra resistance this decreases the current

The p.d. Across a component is measured in
Volts (V) using a voltmeter

The p.d. Provided by cells connected in a series is the
Sum of the p.d. Of each cell (depending on the direction in which they are connected)

The resistance of a component can be found by measuring the
Current through and the potential difference across the component for formula is I = V/R

V represents the
Potential difference and th unit is volts (V)

I represents the
Current and the unit is amperes (A)

R represents
 Resistance and the units are ohms

If the resistance is 5 and the current is 10 what is p.d.
 I = V/R
 5 = V/10
 5 * 10 = V
 50 V = V

if the resistance is 25 and the p.d. is 100 what is the current
 I = V/R
 I = 100/25
 I = 4 A

if the current is 1.5 and the p.d. is 3 what is the resistance
 I = V/R
 1.5 = 3/R
 1.5R = 3
 R = 3/1.5
 R = 2 ohms

the p.d. across a compnent in a circuit is measured in
volts (V) using a voltmeter connected across the component

ammeters are always connected in
series even in a parallel circuit

voltmeters are always connected in
parallel with a compenent even in a series circuit

the p.d. provided by cells connected in a series is
the sum of the p.d. of each cell (depending on the direction in which they are connected)