A 6 V bulb draws 0.5 A. What is its power and resistance? Solution: ( P = V \times I = 6 \times 0.5 = 3 , \textW ) ( R = \fracVI = \frac60.5 = 12 , \Omega )
| | Insulators | |---|---| | Allow electricity to flow easily | Do not allow electricity to flow easily | | Have low resistance | Have high resistance | | Examples: Copper, Aluminum, Iron | Examples: Rubber, Wood, Plastic |
Should we focus on a next, such as the relationship between magnetism and electricity or calculation techniques for electrical power? Share public link f2 science electricity exercise top
: Formed by the buildup of electrostatic charges when certain materials are rubbed together. For example, rubbing a balloon with a woolen cloth causes a transfer of electrons, leading to attraction or repulsion. Current (
Like charges repel; opposite charges attract. A 6 V bulb draws 0
A) It increases. B) It decreases. C) It stays the same. D) It drops to zero. Part B: Short Answer & Calculation Problems
R = V / I = 19 / 2.1 ≈ 9.05 Ω (allow 9.0–9.1) Share public link : Formed by the buildup
State three factors that affect the electrical resistance of a cylindrical metal wire. Length of the wire (longer wires have more resistance).
Three resistors: 2 Ω, 3 Ω, and 5 Ω are in series with a 20 V battery. Find: a) Total resistance b) Circuit current c) Voltage across the 3 Ω resistor
| Circuit | Type | Bulb brightness | If one bulb breaks, other? | |---------|------|----------------|----------------------------| | A | Series | ? | ? | | B | Parallel | ? | ? |