Chapter 13
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
卡片预览 (24 张)
What forms a electrical system?
electrical appliances + electrical components
What is a cell and what does it do?
what: one battery do: provide energy to push electric charges around circuit
What does an ammeter measure?
measure electric current
What does an voltmeter measure?
measure voltage
What does variable resistor (rheostat) do?
reduce electric current, increases electric resistance
What is electric current and SI unit?
• It is the rate of flow of electric charges • SI unit: ampere (A) rate- per unit time
When does electricity flow?
When there is - source of electrical energy (battery) - closed circuit
How does flow of electrical charges affect current?
greater flow of electric charges per unit time, larger current
Symbol VS unit of electric current
I- is symbol of electric current A- unit of electric current
Which direction is convection current?
Current starting from the positive terminal of the battery and ending at negative terminal of battery (unlike charges attract)
Which direction is electron flow?
Starts at negative terminal to ending at positive terminal
How is electric current measured?
with ammeter red- positive black-negative
How is a ammeter connected?
IN SERIES (single electrical path thus, same current passing)
What is a series circuit? 3 POINTS
• A single path • Current - same • One bulb removed, no current flows
What is a parallel circuit? 4 POINTS
• Two/more branches - electrical component in each branch • Current- divides and flows through each branch • One bulb removed, others remain lit (circuit remains closed) • sum of electric current at individual branch equals to total current in circuit
What is electrical conductors?
Low resistance to current
What is electrical resistance?
ability to slow/oppose current
What is electrical insulators?
current cannot flow through (VERY HIGH RESISTANCE)
What is electrical energy converted to?
thermal + light energy any electrical components with resistance will be able to convert electrical potential energy to
What has little to no resistance? 2 POINTS
• ammeter • connecting wires NO convertion of energy when current flows through
Definition 1 and SI unit of potential difference
• work done to drive unit electric charge through the component • in simple terms, measurement of the difference in electric energy between two points in a circuit • SL unit: voltage (V)
How is a voltmeter connected?
• ONLY IN PARALLEL across bulb (connected in series- no current in the circuit due to its high resistance)
What is work done?
process of energy transfer
How is the battery supplied? (energy conversion)
chemical potential energy to electrical potential energy