For electrical charge to flow through a closed circuit what must the circuit include
A source of potential difference
Why some resistance to the value of our constant
because they are ohmic conductors (fixed resistors) and are operated under constant physical conditions, most importantly a constant temperature.
Explain the design and use of a circuit to measure the resistance of a component by measuring the current through and potential difference across the component
set up a series circuit with a DC power supply, variable resistor, ammeter, and the component. A voltmeter is connected in parallel across the component
Components in series circuit
Same current running through each components
Total potential difference of power supply shared between components
The total resistance of two components is the sum of resistance of each component
Components in a parallel circuit
Potential difference across each component is the same
Total coral through the whole circus for some of the currency through the separate components
Total resistance of two resistance is less than the resistance of the smallest individual resistor
Why starting resistance series increases the total resistance while having resistance in the parallel decreases the total resistance?
current has more routes to flow, allowing more charge to flow.
Means electricity supply
50 Hz
230 V
What is the difference between direct and alternating potential difference?
10
Alternating and direct current - Mains electricity and alternating …
Direct potential difference (DC) flows in one direction only, produced by batteries. Alternating potential difference (AC) changes direction periodically
What does a livewire do on what colour is it?
Carries alternating potential difference from the supply
Brown
What does a neutral wire do on and what colour is it?
Complete the circuit
Blue
What does the earth wire do? What colour is it?
Earth wire of 0 V it only carries current if there is fault
Green and yellow stripes
Why is the live wire dangerous even when a switch in the main circuit is open?
the switch only breaks the path for the current, it does not remove the high-voltage electrical potential
Dangers of providing any connection between the live wire and earth
fatal electrocution, intense heating, and a high risk of electrical fires
Energy transfers in every day flight appliances
Thermal energy in a kettle
Kinetic energy in motor
What do step of Transformers do?
Increase potential difference from the power station to the national grid
What do step down Transformers do?
Decrease potential difference from National Grid to consumers
