GCSE Physics
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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)
Card Set Information
Author:
ghoran
ID:
172791
Filename:
GCSE Physics
Updated:
2012-09-24 05:15:59
Tags:
Unit two part three currents electrical circuits
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