Electricty Part 2

Question 1

What type of stored energy does a battery have?

Answer 1

Chemical energy that is converted to electrical energy and some of it to heat energy

Question 2

What does a bulb lighting show?

Answer 2

Current is flowing in the circuit

Question 3

What is voltage or e.m.f?

Answer 3

The energy used to drive one Coulomb round a complete circuit

Question 4

What is resistance?

Answer 4

The opposition to current flow

Question 5

What does resistance vary on?

Answer 5

Length- the longer the wire the HIGHER the resistance
Diameter-the thicker the wire the LESS the resistance
Temperature-the higher the temperature the HIGHER the resistance
Material- a good conductor has LESS resistance, a bad conductor has MORE resistance

Question 6

Describe the wires in cases where a high and a small current is needed

Answer 6

High current needed- wires thick and short
Low current needed- wires thin and long

Question 7

What is the unit of resistance?

Answer 7

Ohm.

Question 8

What are two names of variable resistors?

Answer 8

Potentiometers and rheostats

Question 9

When the resistors are in series to calculate the it’s resistance we….

Answer 9

Add the resistors

Question 10

When the circuit in series the voltage across each resistors is found …..

Answer 10

By using the equation V=IxR

Question 11

When the circuit is in series the current in the circuit is found….

Answer 11

By using the formula I=supply voltage:total resistance

Question 12

What is the Volta meter?

Answer 12

A instrument used to measure voltage.

Question 13

What is a multimeter?

Answer 13

An instrument used to measure voltage,resistance and current.

Question 14

What is a galvanometer?

Answer 14

An instrument used to measure current flowing in two opposite directions.

Question 15

What is the formula for resistance in a device connected in parallel.

Answer 15

RT= (R1xR2) : (R1+R2)

Question 16

Current preferres the path with the most or least resistance?

Answer 16

Least resistance

Question 17

The voltmeter has to be set in parallel or in series?

Answer 17

In parallel

Question 18

What is Ohms Law?

Answer 18

Ohms law states that the current flowing through a metal wire is directly proportional to its voltage provided that the temperature(resistance) remains the same

Question 19

What formula we use for OHms law?

Answer 19

V=I x R

Question 20

What is an Ohmic and a non-Ohmic conductor?

Answer 20

An ohmic conductor obeys ohms law whereas a non ohmic conductor does not obey Ohms law