electricity :}}}

Question 1

what is ohms law?

Answer 1

V = IR

Question 2

what is resistance proportional to?

Answer 2

voltage

Question 3

describe the behaviour of current in a series circuit?

Answer 3

current is constant in a series circuit

Question 4

distinguish between series and parallel circuits

Answer 4

series circuits are when there is a singular path of electric flow while there are multiple paths in a parallel circuit

Question 5

Vtotal = ? (in a series circuit)

Answer 5

the sum of the voltages (V1 + V2 + V3)

Question 6

current in a parallel circuit?

Answer 6

splits in ratio to resistances

Question 7

voltage in a parallel circuit?

Answer 7

voltage is constant in parallel circuits

Question 8

why must voltmeters be connected in parallel?

Answer 8

because they have a high resistance and want to measure the potential difference between two points in a circuit

Question 9

what units and symbol are used to represent resistance

Answer 9

units: ohms
symbol = omega Ω

Question 10

how does temperature affect resistance

Answer 10

If the temperature of a metal conductor increases, the ions of the metal vibrate more vigorously, increasing the number of collisions between the free electrons and the ions. Hence, for a metal, resistance increases with increasing temperature.

Question 11

how does thickness affect resistance

Answer 11

The thick wire will have greater area and therefore it will have less resistance and will prove to be better conductor of electricity than a thin wire which will have higher resistance.

Question 12

how does Kirchhoff’s voltage law follow conservation of energy? (and is KVL first or second law?)

Answer 12

According to Kirchhoff’s Voltage Law, The voltage around a loop equals the sum of every voltage drop in the same loop for any closed network and equals zero. Put differently, the algebraic sum of every voltage in the loop has to be equal to zero and this property of Kirchhoff’s law is called conservation of energy.
secondlaw

Question 13

What is Kirchhoff’s first law?

Answer 13

I1 = I2 + I3 + I4 (charges coming in must = charges coming out)

e.g in a series circuit, charge in in constant, charge out is constant

Question 14

why must ammeters be connected in series?

Answer 14

A Ammeter is used to measure the current flowing through a component/circuit. Since, current remains same in series connection and also the resistance of an ammeter is very small due to which it doesn’t affect the current to be measured. So, an ammeter is connected in series to measure current.

Question 15

What is Kirchhoff’s second law?

Answer 15

voltage in - voltage out = 0 (total energy entering = total energy taken from circuit)

Question 16

formula for resistance in series?

Answer 16

R(T) = R1 + R2…

Question 17

formula for resistance in parallel?

Answer 17

1/R(T) = 1/R1 + 1/R2…

Question 18

method to solve mass of particle given acceleration and electric field

Answer 18

firstly, F = Eq (q should be given)

then you need to find E, which = V/d

V = the voltage drop from plate to plate
d = distance from plate to plate

therefore E has been found.

Then, F = Eq = Ma

therefore ma = Eq

m = Eq/a (SOLVED :) )

Question 19

what is a quality of acceleration of particles inside electric fields?

Answer 19

acceleration is constant if the particle is the same massandchargein an electric field until it touches the plate

Question 20

given wattage of a load and the voltage of the source, how do you find power usage for a series circuit?

Three identical 144 W globes are to be placed into a 231 V circuit. Determine amount of energy used if they are placed in series.

Answer 20

you’ve been given V = 231 V
P = 144 W
therefore to find resistance, P = IV

V= 77 SINCE voltage drop across all 3 resistors are the same

For a series circuit, 3 x 371 = 1111 ohms (total resistance)

then, v = ir to find current : 231/1111 = 0.2 Amps

then use this new amperage in P = IV again, and P = 0.2 x 231 = 48 W.

finally, 48 watts x 3600 seconds = 172800 J of energy used in the series circuit